McHunt,
Don't know if this will help, but I had a major rotator cuff redo on my right shoulder (right-handed shooter) back in 2000. Wasn't sure what would happen to my ability to shoot traditional as a result, but had to do something. Anwyay, after proper physical therapy, I was able to slowly work my way up starting at 45# to now about 60# and feel like I could work up further if I really wanted to. No problems and I actually start to get sore in the shoulder if I go without shooting for a couple weeks!?
Just wanted to let you know that you may not be as limited as you think after rotator cuff repair.
You might want to ask your doc or physical therapist if you have any limitations on your potential to work up after that rebuilt cuff, the nature of the damage and repair differs for everyone, but my experience after an extensive repair demonstrates that with proper, gradual work up, you might be able to get to 70# or more.
Just wanted to let you know that you might be able to get closer than you think to that ideal weight, whatever that is.
Best wishes!