Previous thread from 8-2020 and not much new to add.
https://www.doublegunshop.com/forums/ubbthreads.php?ubb=showflat&Number=577370

The pro golfers & MLB players cured of their "yips" are not sharing the method thereof frown
This might be of interest
https://www.newyorker.com/magazine/...-to-do-it-again?utm_source=pocket-newtab

Probably time for a release, or a future of continued suffering and frustration.
Be sure you have not sifted dominance. Someone will be along to explain "90% of flinches are visual" and they are mistaken. What a flinch most certainly is not is ALL anything; recoil fear, focus, vision, grip, slapping vs. pulling, trigger pull, gun fit, performance stress, hold point or anything else, for everybody. And claiming "it's 90%" anything is simply wrong, and not helpful.
LOTS of things contribute to the dystonia, and many of us have found effective ways to suppress our flinching without a release (for me dealing with my cross-firing, firmly gripping the gun, intense focus, and low recoil loads) but as said over and over, usually a release will work (but often requires dealing with vision issues also) and we don't know why.