Stance
Thank you Dr. Dave! Great stuff!
I'm frustrated that I don't have this totally solved. When I played many hours a day it was never a problem, but these days I have struggled with a couple of things.
First of all, my vision center is very far to the left, but not totally under my left eye. I am a right handed player. I use a more traditional pool stance. I have tried the snooker stance but I do struggle with timing and power, and also distance from the table. For whatever reason I keep coming back to the pool stance. OK, fine, it should work. But my challenge is that while when I am standing up I am sighting the ball correctly under my vision center, it's easy to get off line as I drop into the shot. In other words since my left leg is stepping forward and to the left it is easy for my balance to shift a little to the left and for my eyes to slide out of line. Sometimes I solve this by placing my left foot, then sighting upright again, then making sure I come straight down, but it seems a little clumsy.
My other big challenge is with elevated shots. It doesn't help that I'm 5'7", but Varner and Pagulyan can do it. I haven't figured out the best stance. Do I move my front foot forward, then kick my back foot out and behind me? I don't know what's best, and it's really hard sighting when my body is elevated.
The only solution I've come up with is to shoot lots of drills that require great sighting, elevation, and so on. I just try to outwork it. But I know if I had a better set up I'd play better.
I'll read the rest of your resources and keep practicing. Much appreciated!