Rich, you describe a small part of the exercise regimen-physical therapy that brought me back -- sorry about the double entendre.
I can see only two possibilities. Your answer is the complete one, and I may never return to my previous draw length. Or you are partly correct, but also my previous draw length was not as accurate as it should have been.
All I can write is that when I use either my lighter bow, or when I was monitored at the archery shop range, form, anchor -- ease of acquiring full draw and holding -- all appear copasetic. So was I AFU before, or am I still restoring myself to the way I was?