Try flagging the thumb, and during another practice session try curling the thumb down.
I used to flag my thumb with my P2000, but had just figured it out myself at the time. Todd suggested curling the thumb, which I now use as I'm shooting the Glock 19 and it gives better results than flagging the thumb.
I did them both for accuracy reasons and trying to stabilize the gun throughout the trigger pull, however, not for recoil management.