SELYA, Circuit Judge.
This is another in the seemingly endless line of criminal appeals marching stolidly to the beat of the federal sentencing guidelines. Finding appellant’s lamentations to be without merit, we affirm the sentence imposed below.
I.
Background
In February 1992, a federal grand jury in the District of Puerto Rico returned a five-count indictment against a cluster of defendants. Appellant Richard Ocasio-Rivera was named in three of the five counts. On May 5, 1992, Ocasio-Rivera pled guilty to count 4 — a count charging that, “[f]rom on or about January 11, 1992 and continuing thereafter up to and including January 24, 1992,” he and his codefendants conspired to distribute four kilograms of cocaine to an undercover agent. The court ordered the preparation of a presentence investigation report (PSI Report).
At a sentencing hearing held on August 21, 1992, the district judge determined the guideline sentencing range to be 97-121 months (offense level 30; criminal history category I) and imposed an incarcerative sentence slightly below the range’s midpoint. This appeal ensued.
II.
Discussion
Ocasio-Rivera’s appeal hinges on three assignments of error. We discuss them seriatim.
A.
The Alleged Sixth Amendment Violation
Appellant contends that he had a right, under the Sixth Amendment, to have his attorney present during his audience with the probation officer; that he sought to exercise this right; that the interview nonetheless proceeded in counsel’s absence; and that, therefore, appellant’s sentence should be vacated because it was based, in part, upon information winnowed from him during the uncounselled interview and included in the PSI Report. This contention is reminiscent of a seldom used ketchup bottle: at first glance, it looks full — but, even when tipped, slammed, and forcibly shaken, it is very difficult to get anything out of it.
The facts are these. At the change-of-plea hearing on May 5, 1992, appellant and his lawyer were advised that a PSI Report would be compiled. On May 22, the probation officer, Antonio Bruno, confirmed in writing that he was performing the required investigation. Defense counsel admits that he received this billet-doux no later than May 26.
On June 8, Bruno interviewed appellant. At that time, appellant lodged no objection to proceeding in his attorney’s absence. 'It was not until June 10-two days after the interview had been completed-that Bruno received a letter from the attorney asking for the first time to be present when Bruno questioned his client. At the sentencing hearing, appellant neither alleged a Sixth Amendment violation nor moved to strike the uncounselled statements.
It is a bedrock principle in this circuit that issues must be squarely raised in the district court if they are to be preserved for appeal. See, e.g., United States v. Slade, 980 F.2d 27, 30 (1st Cir.1992); United States v. Figueroa, 818 F.2d 1020, 1025 (1st Cir.1987). That principle applies unreservedly in the criminal sentencing context. See United States v. Ortiz, 966 F.2d 707, 717 (1st Cir.1992), cert denied, - U.S. -, 113 S.Ct. 1005, 122 L.Ed.2d 154 (1993); United States v. Dietz, 950 F.2d 50, 55 (1st Cir.1991) (collecting cases); United States v. Pilgrim Mkt. Corp., 944 F.2d 14, 21 (1st Cir.1991); United States v. Argentine, 814 F.2d 783, 790-91 (1st Cir.1987). There is, to be sure, a narrow exception for unusually compelling circumstances, but it is to be “exercised sparingly,” mainly in instances where the previously omitted ground will ensure appellant’s success and thus prevent a miscarriage of justice. See Slade, 980 F.2d at 31; United States v. Krynicki, 689 F.2d 289, 291-92 (1st Cir.1982).
That ends the matter. On even the most generous reading of the record, it is pellucidly clear that the Sixth Amendment argument was never called to the sentencing court’s attention. Because the issue was not distinctly raised in a timely fashion in the court below, and because the attendant circumstances are manifestly insufficient to overcome this procedural default, we conclude that the issue is not properly before us. Consequently, the assignment of error fails.
B.
Role in the Offense
The court below rejected appellant’s plea that he was a “minor” or “minimal” participant in the conspiracy and, thus, deserving of a reduction in the offense level under U.S.S.G. § 3B1.2 (Nov. 1991). As with other sentence-decreasing adjustments, a defendant must shoulder the burden of proving his entitlement to a downward role-in-the-offense adjustment. See Ortiz, 966 F.2d at 717; United States v. Ocasio, 914 F.2d 330, 332 (1st Cir.1990). Reviewing the record in its entirety, we think the sentencing court was amply justified in refusing to label appellant a minor or minimal participant. We explain briefly.
Based on the facts contained in PSI Report, the sentencing court could support-ably have found that, on January 10, 1992, appellant and a codefendant, Juan Mercado Lopez (Mercado), together negotiated an anticipated multi-kilogram sale of cocaine to an undercover agent; that the two men agreed to sell three ounces as a sample; that appellant remained with the prospective purchaser while Mercado fetched the sample; that appellant repeatedly assured the “customer” about the quality of the cocaine and the availability of the larger quantity for which the trio had been dickering; that the sample was delivered; and that, eleven days later, appellant received-the purchaser’s call that he was ready to close the deal. The capture trap sprang shut as consummation neared.
Although appellant strives to portray himself as a minnow in service to a big fish (Mercado), his portrayal is unconvincing. The facts set out above, in the ensemble, paint a picture of appellant as far more than a minnow. The logical inference — and the one apparently adopted by the court below — is that the two men were roughly equal partners, sharing risks, responsibilities, and rewards. On this basis, we think the district court acted well within its proper province in finding that appellant’s role was neither minor nor minimal. See United States v. St. Cyr, 977 F.2d 698, 706 (1st Cir.1992) (holding that “when there are two plausible views of the record, the sentencing court’s adoption of one such view cannot be clearly erroneous”); United States v. Ruiz, 905 F.2d 499, 508 (1st Cir.1990) (similar).
Appellant’s principal rejoinder is that, since the January 10, 1992 “sample sale” was the subject of count 1 and since count 1 was dismissed, see supra note 1, the judge should not have taken the evidence into account. We disagree. It is well settled in the criminal law that evidence of prior uncharged conduct (or, as here, evidence of prior conduct related to a defunct count) is relevant and admissible to complete the story of a charged crime by illuminating the chain of events leading up to the charged crime and the context in which the crime occurred. See, e.g., United States v. Devin, 918 F.2d 280, 286, 287-88 (1st Cir.1990); United States v. Reveron-Martinez, 836 F.2d 684, 688 (1st Cir.1988); United States v. Currier, 821 F.2d 52, 55 (1st Cir.1987). So here. The January 10 sale, involving, as it did, a sample for the larger transaction that the parties were contemplating, was in the nature of a dress rehearsal. It was, therefore, eminently reasonable for the judge to extrapolate from the events of January 10 in deducing the appellant’s place within, and relationship to, the conspiracy charged in count 4.
C.
Acceptance of Responsibility
U.S.S.G. § 3E1.1 (Nov. 1991) allows a sentencing court to bestow a two-level downward adjustment upon a défendant who accepts responsibility. The ultimate question under section 3E1.1 is not whether the defendant has uttered “a pat recital of the vocabulary of contrition,” but whether he has accepted full responsibility for his part in the offense of conviction by demonstrating “candor and authentic remorse.” United States v. Royer, 895 F.2d 28, 30 (1st Cir.1990); accord, e.g., United States v. Uricoechea-Casallas, 946 F.2d 162, 167 (1st Cir.1991); United States v. Bradley, 917 F.2d 601, 606 (1st Cir.1990). The defendant has the burden of proving his entitlement to an acceptance-of-responsibility credit, see Bradley, 917 F.2d at 606, and the sentencing court’s determination to withhold the reduction will be overturned only if it is clearly erroneous. See Royer, 895 F.2d at 29.
We have placed a gloss on the use of section 3E1.1 in multiple-count cases. In United States v. Perez-Franco, 873 F.2d 455 (1st Cir.1989), we held that, in order to obtain the reduction, a defendant “must accept responsibility solely for the counts to which he is pleading guilty.” Id. at 463. Here, appellant unsuccessfully sought an acceptance-of-responsibility discount in the court below. On appeal, he contends that the district judge transgressed the Perez-Franco rule, denying relief because he, appellant, would not accept responsibility for the nefarious conduct underlying the dismissed counts. The record belies the contention.
As indicated previously, see supra Part 11(B), appellant labored at sentencing to convince the court that he was a mere tagalong in a conspiracy orchestrated by Mercado. The judge debunked this account and found instead that appellant, by proclaiming he was a tagalong when he was actually a full partner, had engaged in a campaign to minimize his involvement in the offense of conviction. It was on that basis that the lower court denied the downward adjustment. We discern no error.
Where a defendant resorts to evasions, distortions, or half-truths in an effort to minimize his culpability, whether during a presentence interview or in his allocution, the district court may appropriately decide to withhold an aeceptance-of-responsibility credit under section 3E1.1. See United States v. Reyes, 927 F.2d 48, 51 (1st Cir. 1991); Bradley, 917 F.2d at 606; see also United States v. Chalkias, 971 F.2d 1206, 1216 (6th Cir.), cert. denied,-U.S.-, 113 S.Ct. 351, 121 L.Ed.2d 265 (1992). This case is cast in that mold. The sentencing court made an explicit finding of conscious minimization-a finding that was adequately supported by the record and not vulnerable to clear-error attack. No more was exigible.
III.
Conclusion
We need go no further. The ketchup bottle is dry (or, at least, congealed) and the other condiments served up by appellant lack zest. Having tasted the full flavor of the unseasoned appeal, we conclude that appellant’s sentence was lawful.
Affirmed.
. The other charges against appellant, contained in counts 1 and 5, were dismissed.
. The Sixth Amendment provides in pertinent part:
In all criminal prosecutions, the accused shall enjoy the right ... to have the Assistance of Counsel for his defence.
U.S. Const, amend. VI.
. We pause to mention two of the several fac- . tors that counsel against relaxing the raise-or-waive rule in this instance. First, the interests of judicial economy would be poorly served; this issue is unlikely to arise again in the District of Puerto Rico because the probation department’s policy is to allow defense counsel to attend presentence interviews upon timely request. Second, although we leave the question open, we do not find appellant’s argument "highly persuasive," Krynicki, 689 F.2d at 292, at least at first blush. Four circuits have held that there is no constitutional right to counsel at a routine presentence interview in a non-capital case. See United States v. Tisdale, 952 F.2d 934, 940 (6th Cir.1992); United States v. Johnson, 935 F.2d 47, 50 (4th Cir.), cert. denied, - U.S.-, 112 S.Ct. 609, 116 L.Ed.2d 632 (1991); United States v. Woods, 907 F.2d 1540, 1543 (5th Cir. 1990), cert. denied, 498 U.S. 1070, 111 S.Ct. 792, 112 L.Ed.2d 854 (1991); United States v. Jackson, 886 F.2d 838, 844-45 (7th Cir.1989). No circuit has ruled to the contrary-although the Ninth Circuit, without reaching the constitutional question, has exercised its supervisory powers to "direct that probation officers be required to permit defendants' counsel to accompany their clients at the presentence interview.” United States v. Herrero-Figueroa, 918 F.2d 1430, 1433 (9th Cir.1990).