The comments in general I think would still stand although if it was more just cable flys then you can impinge the supraspinatus tendon when doing it. It the rotation angle was a new one for you then it is very easy to strain the posterior cuff as they are relatively weak. It is more unlikely with a trained individual to strain the medial delts with this exercise unless there was a lot of cheating with the body involved? It does sound like things are resolving but perhaps look more towards some external cable arm rotations (elbow at 90 degrees), cable horizontal. Especially work/resist the eccentric action as the hand moves back across the body. That eccentric strength and control is an important once in balancing out the head of the humerus at it rotates on the scapula.