[Kdub]

It sounds to me like you start to second guess your self after the first few shots and you are thinking about the release and that is when you start to struggle and you are probably torquing the bow like crazy since I am guessing you are pulling way too hard (I did this really really really bad). I would say that when you start to struggle stop shooting for a bit and when you are shooting never let the bad shoots fire. If you start to struggle let down and start over. I hope this helps.

 

[Widgeon]

Sounds like you might be tensing up after the first few shots. One thing to look at, you should not be thinking about your elbow at all; only push your shoulder blades together and let the elbow rotate because of the shoulder movement. Ideally you shouldn't be conentrating or thinking on your muscles or their movement at all. Have you tried any blind bale shooting or practicing with just a loop instead of your bow?

 

[pscm]

I have done some blind shooting though not enough. I have also used the rope training. The difference here is one doesn't have the same tension so performing the release with this method is indeed easier to perform

 

[sunsignarcher]

consistent form

Are you keeping that elbow up and high shot after shot?

As soon as you get fatigued that elbow will drop ever so slightly and it'll wreak havoc on your release.