What velocity are you getting out of those 147? As others mentioned dwell time and slide velocity can vary radically with the short guns and for me that has been the biggest source of problems in small autos.

I would honestly skip SW to solve it and call Randy or Scott at Apex and see if they have a solution for it.

Hunt hard, kill clean, waste nothing and offer no apologies.

"In rifle work, group size is of some interest...but it is well to remember that a rifleman does not shoot groups, he shoots shots." Jeff Cooper