The Shield is a thin pistol....
All guns, especially semis, hold differently. The differences in ergonomics between any two or three is pretty huge.
My problem has been that I shoot a lot of different pistols, consequently never get really good with any one of them. I'm trying though. I see people on You tube picking up and drilling the target with it.
I shot better before I started with so many guns. I did some dry fire tonight and adjusted my grip and at the range a few days ago I proved from a bench that my third gens problems aren't with the gun. I think I"m going to find that to be true for all of my guns.
One thing I've noticed, is that I can take movies of pulling the trigger and it looks ok, but with a long DA pull my left hand interferes with my trigger finger. I moved my left hand slightly more into a 'cupping' position and it doesn't interfere now. The smaller the gun, the more pronounced this is.
Can't wait to try it at the range.