Hi AZ! I tore my rotator cuff a few years ago so I sure can feel your impingement pain.
I learned a few valuable lessons from my five months in PT and maybe some of these will help you. First of all, if you have impingement issues, you don't want to do any exercise with internal rotation. Examples would be upright rows (the exercise that tore my rotator cuff) and lateral and front raises with your thumbs facing the floor (DB parallel with the floor). Instead do your front and lateral raises holding the DB perpendicular to the floor, as if you're holding a soda can. That opens up the whole shoulder joint and relieves impinegment. You also could do reverse flyes with DBs or a machine for your rear delts. Did your PT have you do the whole series of shoulder rehab exercises and stretches? I still do mine in addition to traditional weightlifting exercises.
In addition to shoulder exercises, your shoulders will be worked secondarily when you're doing chest exercises like presses, flyes, and pushups.
Best of luck to you and here's to pain-free workouts!