Here's some thread's from another forum I have found invaluable.
Whether you have sorted your problem or not, these may be useful for someone else.
The Complete Shoulder and RC Injury Article
http://forum.bodybuilding.com/showthread.php?t=529968
Internal Rotator Cuff Exercise Discussion
http://forum.bodybuilding.com/showthread.php?t=885752
Supraspinatus Tendonitis
http://forum.bodybuilding.com/showthread.php?t=879601