Thanks all for the kind comments, they make the effort worth while.
Dogboy, I'd like to say that the mouth thing is the magic secret that nobody wants to share :D BUT The truth is that I am completely unaware of that really silly looking foible. Looks like I'm a fish out of water and gulping air. The face anchor for me is the "C" of my hand behind the jaw bone, base knuckle of the index finger tight into my cheek bone (see how the skin wrinkles up above my hand and below the eye?) and the middle finger in the corner of my mouth.
Using the bone on bone support at full draw is my real anchor! If you are doing this, then find comfortable references on your face for the string hand. Your bone on bone draw length cannot change so the string hand has to find the spots that keep it in the same position every time. Hope this helps.