Yes, I have many videos from behind and from the front. It's clear what's happening. The challenge and difficulty is correcting it!
I've been a full-time technical development tennis instructor for 40 years. I understand how long it takes to develop technique, especially for very precise strokes.
For the pool stroke I have read, seen and heard probably most methods of developing a straight stroke.
One of the most difficult things in all sports mechanics is feeling, and correcting, what's happening behind you while you're looking at the object in front of you.
I think the bottom line is that it's just going to take more time and correct repetition to develop the feel ("muscle memory") of a straight stroke, even with good instruction, video, training methods and training aids.
I also have a strong technical background in golf. The pool stroke, being such a short simple motion, is very similar to the golf putting stroke, which is also a very simple short motion... an 8-inch (seemingly) simple stroke that a two-year-old can do the basics of!
There are entire books and professional coaches in golf dedicated to nothing but putting... and professional golfers work on it their entire lives.
SIMPLE does NOT equate to easy because of the level of precision required.
The search continues. I'm getting closer. PROGRESS is probably all I can realistically hope for at this point.
From all I've read, I'm certainly not alone in this challenge of developing a straight stroke. I'm sure it drives a lot of people crazy. So I guess there's some comfort in sharing the frustration with others...
Hopefully a year from now I'll have a straight stroke to post a video of
