Take a pic. I've had a ton of problem bridging my collar bone. This might seem impossible but after I worked out upper chest it would get worse. What I started doing was never working upper chest because if there is little to know muscle there then my dominant surrounding muscles are going to take over. So I worked flat and decline bench for the last two years with only light flyes to finish off the workout and get blood into the upper chest. Just this last month I have started to put inclines back in.

Whatever you decide I would do inclines at no more than a 30degree angle