I know exactly what you're putting yourself up against. I am at 9wks post op right now, shot my bow for the first time Monday. I did step back down to my 55@28 rather than my 65@28.... started the morning with the first dozen only drawing 27, if that. By the third dozen I was back to my 29.5 mark on my check arrows. Honestly at the end of 6 dozen arrows I wasn't any sorer than I would have been after shooting before surgery. I had Rotator, Labrum, debribment of the area... and some other crap I can't seem to retain for more than two seconds after the doc says it.
The biggest pieces of advice that I got:
1. Pain meds, take them religiously for the first two-three weeks. Don't wait to feel it, take them on the hours you are scheduled to.
2. Pain meds, take a little extra before PT. it will let you reach the full potential. After the first few weeks you are just breaking up scar tissue and that hurts.
.... oh and if you have the option for a "Nerve Block" do it, if for nothing more than the amusement of having a limb completely paralyzed for 24hours.
I made the mistake of taking a last minute opening for the surgery the week before Opening day, I think I am actually going to be comfortable enough to hit the woods after Thanksgiving. Can't wait.
Good Luck, the sooner you do it, the better off you are.
And Don't sell off the Bows for weaker ones. PT will give you plenty of different colored power bands to work your way back to the weight you want to be at.