Several problems noted here.
1. You did not say what type and size of shot you are shooting?
2. You did not say at what distances you area speaking of?
3. Steel shot performs better to a bit more open shokes than does
lead. Too much choke and you go backwards in performance.
I shoot Briley extended, ported, Improved Modified later in season with it performs much as a X-Full does with lead. I mainly shoot the same style choke in Modified earlier in season and go to the IM later for the longer shots, over 40yds and bigger ducks, and larger shot, 2's and BB's mainly as opposed to 3's and 2's earlier. I also shoot Hevi-Metal as my mainstay shells. I shoot steel as my first shot and then back it up with Hevi-Metal.