I too had an AC separation. Going on 2 years now (Jan 12). It was a 4 degree, my ortho didn't want to do surgery (not that I did either). I still can't handle pressure right on top of it (purse). About the hump, I had to go with tee back bras, just to stay up. (sorry too much info)

Physical Therapy helped. What hurt the worse was the pulling of the muscles on the inside near the shoulder blade. I still get "Trigger Points" near the center of back after a long ride. Maybe a masseuse or chiropractor will be my try, before the cortisone shot the ortho wanted to give me.