I too suffer/suffered from target panic. I tried blank bale shooting, reading books, changing releases, and shooting with back tension. None of these helped me. They were only bandaids that stopped working once your brain got used to that way or shooting too. I even stopped shooting for long periods to see if that would help, and then I finally gave up archery shooting all together for several years. The internet became more popular and I started to do some research on the problem (Target Panic). I found some posts on the tradgang forum written by Jay Kidwell. I emailed Jay and he responded with some basic drills and I could see improvements in a day or two. I kept up with the drills for a couple of weeks and have felt much better about shooting. Now it is four years later and I enjoy shooting again. Good luck, target panic can be controlled you just need to take the right steps and be patient. You can check out his book here
http://www.n-sights.net/iai/target_panic.html it is well worth the $14 if you have target panic.