Okay,
I am doing already much better now. I took a look at the rotational draw video which is great. It confirmed I did not hold my back tension, so I collapsed. I took more attention the the string elbow when shooting and took care it went back, bringing my shoulders together and forming a straight alignment with my bow warm. After the shot, my string hand goes back touching with my stretched fingers the back of my head. This feels more natural to me then touching my shoulder. Touching my shoulder feels like I am going down from my alignment and touching the back if my head feels like following the alignment you already have, so a more natural movement.
For most shots I am on a steady 29 inch now.
I have someone I train with and he is watching if I don't go back with my draw. He told me I improved dramatically. But I must stay focused on my string elbow each shot. Bad habits come in very quickly, but it takes a long time to get rid of them...
Thanks for all the help, highly appreciated!
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