David,
I have done the same thing as you have, only I have not had surgery, but as some have said;
" when your shoulders talk, you will listen" I started out with 53# and found that I was, for one, not accurate, and my shoulders hurt, I have reduced my bows, to 43 lbs., I did have one custom-made and I found out that it is actually 45 lbs. instead of 43 lbs., 45 lbs. is my maximum of what I want, I have found that I am accurate and my shoulders do not hurt.
And 45 lbs. is enough for hunting deer, it is limiting as far as hunting elk, but not enough if you stay within the limitations and discipline yourself.
Besides it's more fun reading the stories of others going elk hunting, and you don't even have to break a sweat ! I'm also going bear hunting with my 43#, I think I'll use the Bob Lee "Hunter" it's good for tree stand, and is also good for shooting inside a blind. It's 56", it's a great little bow.
And like others of said, you will have to make the decision, there are a lot of guys on here that shot between 40-45 #, I also think you have more confidence in a bow that doesn't give you pain. If you look on the classifieds, you will find more bows with higher poundage for sale, and the lower poundage bows do not stayed on there very long.
Pastor Carl