There is tons of stuff on the internet on this. In fact.. maybe too much I'm at total information overload so I wanted to see how some ya'll approach this. I'm not 'injured' yet, but my left shoulder/pec tie in is getting very cranky and is headed that direction and required a focused intervention.
For warm ups I was thinking a BB complex with just the bar of OH squats, muscle snatches/cuban press, wide grip presses behind the neck (keep in mind this just the bb), and OH shrugs. And then some scap push ups. I figured this will activate everything in the shoulder girdle and open up my pecs a good bit. Maybe even before squats especially low bar squats. Maybe even do a prefatigue for my lats and triceps to help me really emphasize those muscles to try to take my shoulders and pecs out of the motion.
I also figured I'd do less volume with the bb for pressing off a bench at least for now.
For exercises I was thinking crazy-bell bench pressing, one arm bench pressing, db bench pressing off of a swiss ball, seated db muscle snatches, push ups against bands, and db raise triset but instead of lateral raises I'll do neutral grip scap plane raises.