You have the shanks... just like in Golf. A mind boggling frustrating disease.

This may sound strange, but here's what I've done in the past with people with the shanks (same thing different sport). Learn by performing the mistake. What I mean is intentionally make yourself shoot low. Instead of forcing yourself to bring the arrow up, force youself to NOT try to bring it up. Make yourself feel like you're locking up and can't bring it back up. Conquer the problem by intentionally doing it and repeating it. That way you get to know what causes it and consciencously feel yourself doing it.