I shoot a Citori XT Trap 32" with a adjustable comb. I shoot a lot better at singles then I do at the 20 yard line or farther back. I have shot 48-49 out 50 a lot on 16 yard with the bottom barrel and improved mod choke. I have tried the same set-up on the 20 it did not do very well. I have shot the top barrel with full choke about the same results. Need some advise, thanks.