I'm going to drift off topic a bit.
I'm kinda screwed. A brain tumor damaged my vision centers. I will never shoot as well and nothing can help it.
I don't mean to be cruel or argumentive but I don't by the "I will never shoot as well"
It's that you never found the coach that could address your situation.
I'm of the Gary Anderson belief "THERE ARE NO HOPELESS SHOOTERS".
I'm gonna beat my horn a little. I've been a firearms instructor for over 40 years. A bit longer but a bit over 40 years when I took my first formal instructor class (FBI's LE Firearms Instructor Course).
For some reason the department discovered I had a knack for identifying problems with shooters. An example one such officer couldn't qualify. He did when he hired on, but as time went on. He just couldn't qualify.
The Sargent sent both of us to the range. I had him shoot. I watched him. His movements, stance, follow through, everything, every move he made. I couldn't really detect anything wrong but I did discover some weird facial movements when he shoot.
I told him to go to the eye doctor and come see me after words. Yup it was an eye problem. He started, not just qualifying but maxing the course. He went on to attend my sniper school, retired as a Captain. He was also in the National Guard, Shot of their (my) NG Rifle teams, and retired from the NG as the state Adj. Gen.
When I first got married I took my wife hunting. She attempted to shoot a young buck at moderate range. Clean miss. I made the mistake of telling her that that's the first deer that Model 70 ever missed. She started crying saying she was always told she would never be able to shoot do to her eye sight.
Wrong. I took her and that rifle to my back yard range, adjusted everything for her and had her wacking a 6 inch gong consistently at 400 yards. Later sent her to a Long Range Shooting School and now she has no problems shooting steel at 1000.
I could go on and on, but I think I made my point. The Army Marksmanship Unit, (best shooters AND instructors in the world) Employees a full time Optometrist just to address eye problems.
Write the Army Marksmanship Unit. Ask for guidance and they will steer you where you want to be.