Today is my 68th birthday and I started archery when I was 8. I would advise you to rethink your form for longevity. I used to shoot with the same stance and 68 pounds. It twisted my spine. You may want to think about some bone on bone contact to take some stress off joints. Stress that you don't notice now, but give it a few years.
In addition, when I took the Rod Jenkins class, half of the class had TP from the GFA swing draw.
On the other hand, I sure can't argue with your results. Very good shooting, with what must be well tuned equipment.