One thing that I was told about by a PAA pro years ago and read again lately that has worked for me and more recently one of our group goes as follows. Draw the bow back with your eyes closed-let down. draw with the eye over your arrow closed-let down, draw with the arrow eye closed anchor and then close that off eye and open the eye over the arrow-let down. Do this a few times to get comfortable with it. then draw with arrow eye closed, open it and close the other, then open the other hold a bit then let down. When you get comfortable with that, draw with the arrow eye closed, open it and close the other, then open both tighten and release.
I started flinching again awhile back it took me about 15 minutes to get rid of the flinch.