downzero

I went to the range yesterday it was cold, late, I really didn't have much time. I was just attempting to shoot groups and found myself re-gripping the gun with my left hand after each shot. I've never done this before where did this little demon come from? I believe I had too much pressure in my right hand and my left was trying to get in the game. Any help before it becomes a nasty habit?

I bought a bunch of different weight recoil springs to try in my STI Eagle .40. Each recoil spring came with firing pin spring. Presumably each recoil spring needs a different weight firing pin spring? Or is it that when you change the recoil spring you should change the firing pin spring?