And I also feel that guys who think a couple ounces of imbalance are the reason for poor shooting are probably fooling themselves.
Amen.
I have friends who can adapt to nearly anything within reason, and still shoot very well. After a few shots with a gun your "muscle memory" goes to work and things settle down. A good shot is going to be a good shot, regardless what he is shooting.
That last bit of proper fit of gun to man will probably only increase your score a few birds...............but in competition one or two percent increase in score can be huge. Many, many shoots are won or lost by one bird.
SRH