RE: Pin Gap
Since going to a slow setup this year,I have put my pins at 22,30,35,40,45.
22 carries 25,only about an 1" low and my 30 covers anything from 26-30 so as far as a hunting setup,it works great.
A trick I use for gapping(when using 20-30-40)though is setting the 20 on top of the kill zone and that usually would put my 30 on the bottom,that was a great way to hit the kill zone,if you are wanting spot on accuracy,that takes alot of practice.