I think the big problem here is shot anticipation. I used to get it to a very slight degree at times but haven't had any problems with it the past couple / few years.

You just need to keep reminding your self to be 100% relaxed and to not tense any other muscles not needed in your shot sequence.

Here is what you could try to help out....

Go for a practice session but don't shoot ANY arrows. Go through your pre shot routine draw your bow hit your anchors put the pin where you want and hold it there on target for 5-10 seconds and let down. Repeat 15-20 times per session. A few days of this may help you. It is what I did when I had the problem and it took care of it for me.

Good Luck