I have noticed lately, when I screw up I can run it through again in my mind and know what I did wrong, It's usually concentration. I use to be able to do this without thinking at all about it, but that was from 57-74, now that I'm back at it at this age I have to figure out everything to be half way decent, but at least now I am learning about the mechanics of what I use to be able to do naturally. Keep practicing and don't forget to use the blank bail if you have problems.
Happy new year.
P.S. Stumpkiller, I give you credit for shooting with glasses, I can't seem to be able to get the hang of it so I shoot without them. Luckily I can still shoot pretty good without them.