Today I learned that PD does affect my shooting ability.
I can fire off about 20 rounds OK (lots of shaking but somehow I'm hitting pretty good--not as good as before but not bad). After that, my hand, especially my trigger finger, is much too weak. I have to use both index fingers to pull the trigger for the remaining 30 rounds. After that, I can barely use my shaky hands to do anything, and my arms and shoulders hurt.
It's just a small revolver.
After we practiced, TCS took my gun over to the gunsmith at the range. He put in a different spring that requires a lighter touch. Next time it should be easier.
TCS told me that he could tell that I was shaking because from his booth he could see my red laser dot bouncing on the target.