Love my fastback. I sits me down and back a little. Very comfortable. Kind of just cradles you. Lots of long days on it no issues. as others have said their customer service is top notch. Call them if you need to be moved back further they can do that.
It'll move you back about 1" and lower you about 1". Resist the temptation to go for stitching or anything other than smooth untextured leather. Sure it looks cool but your fanny will never let you forget your decision. The backrest is a great option as is the removable passenger pillion.
I have the C&C solo on my '08 Standard and find it very comfortable. I tried a seat from a street glide just before I bought the C&C solo and would say it is sits about the same but is more comfortable to spend the day on.
The C&C solo will move you back 1 inch and down 1 inch....BUT.... for a few more bucks you can have them custom tailor it to your specs. I've put a C&C on the last 4 touring bikes I've owned.