I've seen quite a bit on the mechanics of the draw, but, I have never heard a description of it. For instance when we draw the bow, to full draw, how much are we rotating our ball and socket joint? From what I can see you would not want to rotate that shoulder so far back that the elbow is inline with it. This would give you a huge increase in draw length, but, it looks like you are putting the shoulder in a compromised position by stretching out the rotator cuff. Now if we just draw back to a point where the draw elbow is juuuust outside inline of the nock, your follow through at release will be right behind the nock at the shot.
My ? is how far are YOU rotating/pulling that draw shoulder around/back? All the way as far as it goes with out binding/tensing up or straining? Draw elbow directally behind the nock? Draw elbow juuuust out side the nock? Of coure at full draw in front of a mirror, where is that draw elbow? And what sesation do you get in the draw shoulder at full draw? Locked back and "AROUND the Straight Away Plane? or just to where it is smooth and comfy??