Here is another way to find your 'natural' anchor point first, then we can move over to back/lateral tensions.
Stand comfortably, face forward, arms stretched out to the side, eyes closed. With NO influence, simply bend your draw arm in and allow the index finger to touch the face. This is the natural 'touch' point and don't be surprised if it's not where you 'think' you should anchor...like he corner of the mouth...because the elbow will 'naturally' be lower.
Now on to back muscles as taught to me years ago.
Deep hook with finger tips pointing backwards and string in the first joint or on the pad between the first and second joint. Use the fingers only as a 'hook' around the string and draw with the back muscles, allowing the elbow to follow in line with the shoulder (feels like it is behind the head). Back of hand, wrist, forearm and shoulder MUST stay relaxed...concentrate on this during the draw. To do this, when you draw, pretend that there is a small hump in front of the riser that you have to get up and over before your forearm can rest on it. As you do it, push the bow arm straight out BUT make sure your bow shoulder comes DOWN and the bow back and lat muscles lock into place (rock solid). Lock the draw arm back AND lat muscles in place, lock web of draw hand around the back of the jaw and make sure that the index finger is touching your 'natural' point on the face. The web/jaw is the bone on bone true anchor. At anchor, about 80% of the pressure on the middle finger, 20% on the index...no pressure on the third finger...just rest it there or take it off. Now both back/lat muscles are in full play and locked. The bow should stay up and loaded with thought so now it's time to let go of all the tensions you didn't think you had...relax the arms and let the wedge pressure of the bow be held by the tension of the back/lat muscles...no arm involvement...no shoulder involvements...no neck tension...no tension of any kind other than the back/lat muscles locked.
To release, simply squeeze the back muscles tighter while relaxing the fingers. The string should 'kick' the fingers out of the way and the hand will 'fall' back naturally...no need to pull or make the hand come back unnaturally. The shot should come as a surprise (no anticipation of when or how) while concentration on the back muscles being squeezed together.
There is one very common mistake that permeates the sites and that is the concept of 'pulling' through the shot. Most people think it is a conscious effort, using the arm....flinging or pulling it back upon release...IE trying to touch the shoulder...wrong..wrong...wrong.
If everything is relaxed properly, and the tension is in the back/lateral muscles properly, there is no need for anything conscious. It will all happen naturally.
Anything at release (other that back muscle squeeze) adds a value of probable error to the shot.
However, in saying this, and knowing everyone
has their own 'way', sometimes something done
incorrectly can be semi-perfected to
consistency...it becomes their 'right'.