Almost 20 years ago, when I started shooting, I used to go over to my pro-shop owner's house and shoot with him. If I started having problems, it was evident in my groups. So he'd put his bow down, and watch me shoot. One of the ways that I learned to pre-correct mistakes was that every time I made a shot using bad form, he's smack me on the back of the head with a rolled up newspaper.
Hmmmm, I wonder if he could cure target panic??