Before going to trigger bumpers I would look at to other things.

1. Gun Mount- is the gun firmly mounted to your shoulder? I have gotten rattled when I was sloppy with my mount.

2. A subset of #1 is the stock too short, consider trying an add on pad.

I have never found trigger bumpers useful, while it is possible you have large fingers compared to your trigger, My gut is to look at the mount

Michael Dittamo
Topeka, KS