RE: Flinching while shooting
I use a True Fire X-Caliper release and it has two ways to release the shot. The standare . . . pull the trigger to release and a relax to fire . . . you lock the jaws on, draw your bow, and just relax your hand to fire. I have my trigger set very light and I don't dare think about releasing until I am ready.
This is True Fire's answer to back tension and it works great for me. [I'm on my third dozen nocks . . . but I love the groups in the bull.]
Bowhunter