When you say a bit more gun than needed and reference shooting minor I assume you are shooting Production class then? Good place to be and no horrible handicap, you could always investigate lighter loaded .45. I know people who have made master class shooting a Glock 19 so compact guns aren't the end of the world.
Or you could move yourself to Limited 10.
As far as shooting what you have, I started in L10 with stock 1911s but became mainly a production shooter. Got bored, wanted to play Limited, had no STI to do it. So I stuck 22rd mags in my Production Glock 17 and went off to play, taking the minor handicap.