Thanks Arne.
Yes, I felt tired sometimes. Yes, I was looking for my anchor. I have a 3 point anchor that naturally appeared - index finger on the corner of my mouth, feather on the nose tip and thumb knuckle on the ear lobe. Those shots that my hand is somewhat moving was that the feather point wasn't there.
I do have a question. When I was concentrating on back tension and on the elbow issue, my string arm shoulder turned and made a movement like if it has popped out. I'm having trouble in finding the words to describe it, but you can see it in some shots. It didn't hurt, it's not that. It sort like the upper muscle, the one that runs from the top of the shoulder to the neck, relaxed and made a click. The shoulder dropped, the back tension was there, it was quite comfortable and the shot came accurate. See minute 1:07 and 1:20 and watch my left shoulder. You will see it drop.
At first it looked like I was going to dislocate the shoulder. Then I tried to reproduce it, and I can, but only at full draw. While I'm drawing I haven't been able yet to find the rotation necessary to get the shoulder in that position.
Is that wrong?