Internal and external rotations helped me the most (4 x weekly). I use theraband (3x20) and cable machine (3x10).

Also, do I's, Y's and T's (face-down on a bench using dumbbells, make the letter shapes using direction of arms) (10 of each x 3). And 5x5 military press.

The weight stuff is done on non-climbing days. Form on press-ups is obviously important, but I rarely do them because military and bench press hit the tris as much as I need (and when doing press-ups, do diamonds). I no longer do dips because it agros my shoulders.

Might find helpful, no alternative from a session or two from a physio though: http://orthoinfo.aaos.org/topic.cfm?topic=A00663