I had rotater cuff surgery three years ago and after about 2 years of rehab I have been able to get my shooting back. I had a hot Merlin storm set up with max 2000 cams and had to sell it cause I just could not get through the buildup.
I picked up a Matthews LX and am able to shoot it at 55 lbs but I pretty much have to cross my eyes and expell gas to draw it , and then If I even think about creeping that bow takes me for an unpleasant ride. I did manage to take a deer with it this year.
I picked up a little 2lb high country bow last year with a carbon riser and found it easier to shoot. I just traded up to a SST or Tss whatever and am pulling 65 lbs and getting high 300fps with it. I can easily do a half hour shooting session and not fatigue. The cam on the High country seems to have a longer power stroke and a much softer buildup when drawing. I guess if you have shoulder problems It is worth checking around different bows to find one that mechanically reduces the stress of drawing.
I have heard good and bad things about the High Country , but I Am leaning toward taking it on a big game hunt and use my Matthews as my backup bow.
The biggest Problem with the high country is it looks and feels like a kids bow, but it really slings arrows.

I was shooting my old 42 lb Bear Temujin Target recurve last night and did about 200 shots and my shoulder only hurt for about an hour after the session. If I did that many with my compound I would probably be in intensive care!
I am a lefty and my right shoulder is where the damage was. My biggest problem is not so much the draw, but having the strength to hold the bow up and steady.
I do a lot of light weight workouts on my old nautlis weight setup.