A couple months back I started getting pain in my left shoulder around the deltoid. I thought I was just pushing myself too hard (Was doing assisted dips and was really wanting to be able to do a full set of body weight dips without assistance before summers end). I took a break from the gym because I also hurt my forearm and anything that required a grip would cause pain in my forearm.

The forearm pain is gone and I've been back but the pain in my left delt region is still there when benching. I notice that if I tuck in my arms when benching I have less/no pain. Can't lift as much doing this.

Anyways, I plan on going in again today and will ask the trainer to take a look at my form and give me his opinion. Would changing to incline or decline put less strain on the delts?