You asked: "am I hampering performance or enhancing it"
I think if you look into it, shooting weights above 65 pounds is where you start to get into diminishing returns. What you get in additioanl speed is offset by lots of other factors. The need for heavier spined arrrows and heavier arrow weights. The difficulty at making the first shot count on a cold day after sitting for three hours. Years ago I shot 85 pounds. Now I shoot around 52-54. I shoot a lot better. I also draw 30 inches. We have an advantage. The string acts on the arrow for a longer length of time. I have heard it written many times, but I haven't seen it confirmed with testing, that increasing one's draw length by one inch is equivilent to raising the draw weight by 5 pounds. Dan Quillian use to talk of this quite often.
As one who has been there in the past, I can only say, I shoot a lot better with less weight and I don't see any drop off in performance that hinders my ability to take game. I killed a very nice moose last year and put a big ace broadhead out the other side with a 58 pound longbow. My shoulder was not collapsed on my face hindering me during the shot.
Hope this helps. If it isn't what you were really asking, then ignore it. I am not trying to preach, only offer an opinion but opinions are sometimes like noses, everyone has one.
Enjoy your holidays and enjoy your shooting and shoot often, someday we may not be able to anymore.