Hi
thanks,
in this site is an article on shoulder instability, good explanation exercises etc.
i'd make exercise various ie different weiths, machines, cables-pulleys, change break time, reps, movements - change range of motion, do joint sets etc, incorporate different actions in one move ie elbow bend with shoulder adduction and rotation etc etc. use eccentrics as well
you shouldnt do more then 12 weeks one routine cos a body gets used to it and stops developing.
all the best