How to prevent Bonavita 1900 TS drip-brewer from producing bitter flavored coffee? My family bought me a Bonavita 1900 TS for Father's day. Unfortunately after burning through 3/4 of a bag of coffee, I still haven't produced a good tasting carafe of coffee. Every time, it comes out (varying levels, but still) bitter and dry. 

I tried grinding (with my Capresso Infinity) in the exact middle setting and worked my way all the way to the most coarse setting under coarse. Can still go further, but I have a feeling I'm missing something. 

I'm using BJ's Kona blend Arabica, medium roast. Yeah, not the highest grade stuff. But I like it good enough from my old 12 cup Cuisinart at 6 scoops with 12 cups of water (per the coffeemaker measurement). 

I've tried anywhere from 55-65g of grounds with 1L of water in the Bonavita. Which is way more grounds than I used to use in my old Cuisinart, but I'm trying to follow recommendations I've found online.  

Any ideas?
I recently purchased the Bonavita as well. After years of using basic automatic drip coffee makers this was an adjustment. I still haven't perfected the art of the cup using the Bonavita. The problem is that the Bonavita brews at the correct temperature, so I think you really need to be a little more precise when brewing (at least that's what I discovered).
First of all, the Bonavita brews only 8 cups--and each cup is only 5 oz. I use a scale to get as close as I can to the correct water-coffee ratio. I no longer use a scoop: a scale is the way to go.
I have found that with the Bonavita a medium course grind is best. I also found that lighter roasts are less likely to produce the bitter flavor you are experiencing.
I usually brew at a water ratio of 1:14. So that means that I use about 84 grams of coffee for a full pot. I know, seems like a lot of coffee. i never used that much with my Mr. Coffee.  But, once you figure out the correct grind and amount, the Bonavita produces a great cup of coffee.
Go to https://baristahustle.com/the-coffee-compass/ and read the article. The &quot;Coffee Compass&quot; really helped me out in trying to get that great cup. Just the other day, I ground up some coffee at a slightly higher setting and the coffee was weak. So now, using that setting, I had to up the amount of coffee by a couple of grams and it was perfect. And that was thanks to the Coffee Compass.
It is so trial and error, I have to say.
Here are the basic ratios to use with the Bonavita. I have found that the 1:14 produces the better cup in my opinion. Also, lighter roasts tend to not be as bitter as the darker roasts.

Bonavita cup = 5 oz. (147.87 grams = 1 Bonavita cup or 29.574 grams an
ounce) Each cup = 5.215 ounces
4 Bonavita Cups = 20 oz = 591.47 g   (Ratios:  1:14=42 g; 1:15=39 g;
1:16=37 g) Note: Finer grind
5 Bonavita Cups = 25 oz = 739.33 g (Ratios:  1:14=53 g; 1:15=49 g; 1:16=46 g)
6 Bonavita Cups = 30 oz = 887.20 g   (Ratios:  1:14=63 g; 1:15=59 g; 1:16=55.45 g) Note: Medium grind
8 Bonavita Cups = 40 oz =1182.94 g  (Ratios:  1:14=84.5 g; 1:15=79 g; 1:16=74 g) Note: Courser grind

Hope this helps. Happy brewing.