Jeez thats crazy..i never been to a thrash metal show before lol. Thats good that you are pretty much 100% though. I have been having shoulder issues for a while now and its a pain in the ass.
Yea, I know all about shoulder/rotator cuff injuries all too well. Last year was the worst but I managed to train through the pain and now (knock on wood) everything is 100%. doing rotator warmups/exercises seemed to be of huge benefit prior to and during any type of chest or delt training.