Thanks, guys, for your help. And sorry to shahamit for hijacking your thread.
I've found, that a little more warming up seems to help the shoulder. I started doing a couple of lighter sets before hitting my work set, and this seems to alleviate some of the problem. I've also noticed that the pain decreases when I pull my elbow in a bit closer to my body. Not sure what that means.
Dips bother the shoulder, too. Plus, I always feel like dips activate the lower pecs quite a bit. I don't know if this is true or not, but I try to keep the focus higher if I can.