Its definitely more anterior. It's hard to tell exactly which muscle it is since there is discomfort both during curls as well as flyes and benching. It doesn't feel like shoulder pain at all just something tight at the armpit area.
I can do prehab/rehab exercises without pain. Honestly its not even that bad right now, just umcomfortable and feels like it may get worse if I keep doing what I'm doing. Any suggestions for prehab/rehab work for this issue in particular? The only thing I really do like that now is foam rolling it once per day for the last week and a half or so, and for the last year or so I've done a set of 15 external rotations, internal rotations and back rotations (not sure the actual name) for both shoulders before any benching.