I can relate to a whole lot of this Jimmy. I grew up a bird hunter, later a pro bird dog trainer so shotgunning was a way of life for me for 30+ years. Dbishop above is a nationally ranked sporting clays shooter....one of the best. So both of us can relate to the story you tell here.
I can also relate to the Type A personality....Javi will probably chime in with his .02 on this one..lol. Anyway, something of a flinch, combined with having to "control the shot" has been a big thing for me to overcome in my bow shooting. For 40 years I'd just aim as I was drawing, and release as soon as I hit a corner of the mouth anchor.....that little type A voice in my head that tells you NOW!
This caused the flinging of the hand...or jerking of the trigger with a scattergun. Anyway, the only way I've been able to overcome this has been with Javi and Arne's help since picking my bows back up in Nov. 2010. I found this site shortly after and have been on a quest to shoot better and more competitively since.
A few weeks back Javi broke through in his fight to cure me of these issues by having me draw deep into my back anchor first....then bringing my string hand into my face. Doing it in this manner aligned me perfectly, and as I keep back tension up while aiming the release is no longer a conscious, almost violent action on my part....it's more a product of the form as I allow the shot to happen. He's constantly beating me over the head to shoot "relaxed"...and dang'd if he's not winning over the little guy in my head.
About the time I was working through all of this I ran across your videos. It is tremendously helpful to watch someone whose form is top notch, and consistent from shot to shot whether it's a target or self bow. I've come away from all of them with something that I can incorporate into my own shot sequence and mental process. Thanks!