普通「ご確認ください」を使っています。

それで、「ご確認なさってください」って何か変だと感じますが、何故か説明して頂けるなら助かります。
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word-choice keigo
「ご確認なさってください」って変？
The root expression is （確認する | conjunctive form）＋（くれる｜command form） = 確認してくれ

This first part 確認して can be interpreted as either (1) a single verb phrase
"確認して", or (2) noun 確認 + verb して

(2) is the historical interpretation but in recent years (1) has become more
common.

First we look at case (1). When applying keigo type expressions such as sonkei
and kenjyo to the verb, we must apply them to the final verb. Applying keigo
to both is called "double keigo", and it is wrong - although even NHK
announcers are prone to this mistake. The result is "確認してください". However this
is still the "くれ" strong command form phrase, and we would like to apply the
"ます" teineigo in it's command form ”ませ”. This gives us the even more keigo
meaning sentence "確認してくださいませ".

Looking at case (2), 確認 is a noun. The honorific ご is a form of teineigo which
can be placed before the noun as a form of decoration. It is not a sonkei or
kenjyuu expression, so it is not at all required to be present. The rest
follows as in case (1), so we get "ご確認してくださいませ" or just "確認してくださいませ"

Reference:
<http://www.excite.co.jp/News/lifestyle/20140306/Okguide_2452.html?_p=2>

Disclaimer: I largely translated the reference, changing 参考に to 確認. The
comment about NHK announcers was in the reference - I deny personal
responsibility for any slander.
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There is a idea that it is natural.
<http://news.mynavi.jp/news/2015/06/11/042/>

It seems be called 敬語連結. If two honorific words are connected with て, it is
used. For example, おっしゃってください.
<http://detail.chiebukuro.yahoo.co.jp/qa/question_detail/q11120121226>
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「ご確認ください」は尊敬語、「確認なさってください」も尊敬語なので「ご確認なさってください」は二重敬語かもしれませんね。しかし、いずれにしても問題ない表現だと思います。変に感じるかどうかは個人差のある問題だと思います。

P.S.
一般に、尊敬語の命令形は（尊敬語ではなく）丁寧語になります。命令形は聞き手へ向けられるものであるところ、聞き手への敬意を表すのは丁寧語だからです…多分。
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