"Punching" is 100% mental. There is absolutely nothing on the market (that's feasible to hunt with) that will help you get over it. The ONLY thing you can do is to work on your form and work through your problem. Back Tension releases are useless in the woods since they are one of the types of "surprise" releases. So if you are wanting to actually solve your problem, then you need to solve it with the equipment that you will actually be hunting with.

One easy way is setting your release to a hair trigger setting. I'm talking just blow on it and it's off to the races setting. Keep not only your bow hand but your release hand open as well (if you are using a wrist strap release). This helps more than you would realize. Hand open, trigger finger behind the trigger, thumb touching just to the back of your neck, settle pin on target, lift finger to trigger, relax hand letting the strap and thumb take all pressure, trigger release.

Try that, if you do it exactly as I said, you will find your "punching" will be greatly reduced if not completely gone. Both my boys had this same problem and this little trick worked perfectly for them. Of course my perfect huntress daughter never had issue 1 with a bow (little minx) dang girl was born with a bow in her hand. Wife said it made labor a bit on the difficult side