Curveman, you're wrong about the heavy bows possibly hurting your shoulders. I was shooting around 100 arrows a day for years, shooting a 67# longbow. I was in top shooting shape, able to draw pictures with my arrows at 20 yards. I rarely entered a tournament without taking 1st place.
I overdid it one weekend, after warming up on the bales, shooting the 30-target 3-D range, then shooting the 50-yard target for too long with friends, just for fun. I held longer on the 50-yard target, aiming with the point. I felt no discomfort until time to leave, but when I rolled up the window on my truck it felt like I had been stabbed with an ice pick in my left shoulder.
I couldn't shoot at all for about a month, and my shoulder is hurting right now as I sit typing. I have good range of motion, but the ache is there nearly all the time. I dropped to 55#, then 50#, trying to get my accuracy back. I've never recovered the level of skill I had, and now I'm shooting a 40# recurve most of the time, happy to be shooting at all. I can shoot a heavier draw weight for a short while, but for regular practice I have to stay low, and I can't shoot every day. Last season I hunted with a Dean Torges longbow, 57# draw, and found that the broken-wrist style grip aggravated my shoulder even more. Not being able to stick with Dean's bow REALLY hurts!