I reversed the mag release. Now I just need to get use to it and put some strength on my index finger. Someday I will get another 9mm pistol and even permanently customize the grip of the Glock if I'm serious about action shooting.
I was using Speer Lawman 9mm 124 grain at the match and I think the problem was not the ammo. I was aiming at the middle of the steel plate and at 32 feet. Yes, low hit is not reliable, I will remember to aim for the top next time.
======================
Some thoughts on dropping a Pepper Popper:
Glock 22 is a 40sw. You using a 9mm conversion? Is the gun sighted for the 9mm conversion?
At 32 feet if your shots are too low on the popper, you probably have a flinching problem.
Poppers are USUALLY calibrated prior to a match using 9mm ball (FMJ) ammo.
Speer Lawman ammo is the TMJ bullet, isn't it? TMJ bullets are a fancy name for plated bullets.
Plated bullets are not like FMJ bullets. Plated bullets tend to break up on impact, much like lead bullets.
When the head breaks up it does not transfer as much energy to the popper. Real FMJ heads flatten and keep pushing the plate.
I suggest volunteering your TMJ ammo to calibrate the plates when the course is set up so the plates fall with your ammo. It's just a game.
Good luck on your next match.