I'm going to agree with IW on that one. 5x5 doesn't seem like much, but my experience is that it ends up being a lot of work, mostly because the intensity is higher on a low/med rep set. I would almost be willing to say that 5x10 is less stressful overall, not that I would suggest that either. 3x5 (working sets) would be fine, with a couple warm ups thrown in there. Heck, I even find that in my own workouts that my 3x5 week is pretty hard to get through and that I actually enjoy the 3x3 week that follows it even though the weights go up. It would be worth playing with. I am not sure that you can overestimate the amount of recovery that you need Besides, you can always bump up the volume if you really do find it to be too little. But with your shoulder the way it is, I can't see any fault in knocking off the work before it starts to be troublesome, so long as the work done is quality.