I agree with what most have said. Most states have regs for draw weight. ie 40 lbs for deer, 50 lbs for elk. I have had a number of different bows. I had a Mathews Switchback (solo cam) that was probably up there for me as the smoothest drawing bow I have owned and it is 15 years old. I also have a Mathews VXR that is only a year old and is probably the easiest to draw. Doesn't feel as heavy to draw but was not necessarily as smooth.
If you are in for a new bow and have the opportunity, shoot a few different brands. I don't know that there is really a big difference anymore and you are likely to find something to work at lower poundage.
I also do workouts to help with my shoulder to make sure that I can lessen stress there and be able to shoot for a long time. For me, shooting is a stress reliever and timeout from the world in my own backyard.
Could even go the traditional route for bows.
Good luck no matter which route you go!