I'm also dealing with rotator cuff problems, with some impingement of the biceps tendon.

Taping the supraspinatus muscle (and sometimes the deltoids) with Kinesio tape is the only way I have been able to ride (and race) without pain while I go through physical therapy and heal. Arnica ointments also help, as do the intense anti-inflammatories they put me on. It's been months. The doc may give me a cortisone shot at some point, but he wants to do that as a last resort sort of thing.