The secret of good form is to learn it. The best thing you can do is carefully learn the process of shooting from gripping the bow and nocking the arrow to letting the bow down after the shot. Notice and learn everything you need to know to incorporate good form in all your actions, then practice it enough that you can do it without thought (instinctive). That is why blind bale work is good -- the only thing you have to work on is your form. (Shooting instinctively simply means you have done it enough you don't have to think about it to get it right.)
Although most of "good form" is mechanics we all learn, there are some things that are personal about it. Do you shoot better after exhaling or when you hold your breath; do you squint one eye, have both open, curl your tongue, wiggle your ears or whatever. Whatever it takes to make your "good form" work, learn that and practice it.
Once you have that form instilled in your muscle memory, if you start having a bad day, it doesn't take long to go over your form from start to finish to see what you're doing wrong.