Glad to see you're back! I have also struggled with shoulder issues. Thankfully...I guess...no rotator cuff tears just arthritis. The only cure will be shoulder replacement. My understanding is that surgery makes the rotator cuff repair seem like a walk in the park, so I'm doing all I can to delay it. For several years I was relegated to hunting with a 48# compound bow. It was still bow hunting, but man is compound practice boring
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Part of my issue was my doctor misdiagnosed it as an AC joint issue and sent me to a therapist for that. The exercises not only didn't fix it, they increased the pain. I went to an orthopedic doctor and he said it was definitely NOT AC joint and to stop a couple of the exercises. One cortisone shot and an MRI later, I found out the true issue. I could get another shot, but that won't fix it and can actually weaken the rotator cuff. This summer I started out trying to draw my 40# Slick Stick (it scales 38# on my scale). I found that by slightly changing my draw, I could shoot with little to no pain. I kept my practice sessions short and worked up to my 45# Kiowa. Then I saw pictures of the Arctic Gray Kodiak Magnum and could not resist.
I'm back to having fun with a bow instead of just using it as a tool. My plan is to hunt with the Kmag this fall. I do a lot of stump shooting, so I have time between shots rather than launching a quiver full of arrows one after the other. Dandelions inside of 22 yards are in serious danger of losing their heads now!
Now, if I were you, after you've consulted with your doctor, I'd try to find a lighter bow to start with. I still have days where the Slick Stick feels about right, so I don't push it. I just stump with the light poundage on those days and be happy. I don't think I'll get to the point where I can shoot much more than 45#, but I'm okay with that. I figure trying to be macho at age 70 is just plain silly anyway. Take care of yourself, and again, welcome back!