When you're feeling better, try pin-pointing where your weaker muscles are, when you bench. What has the most DOMs, what looks disproportionately smaller, etc. As Arnold would say (yeah, he's an idiot. But obviously, an excellent source for strength-training knowledge) "expose your weaknesses and focus on them." Do isolation exercises on the fancy pulley-machines. My bench used to suck-ass, but I did tricep cable extensions and curls on the same machine... just further away, to increase the tug on the arm and improve range of motion. Lots of skull-crushers and fore-arm curls. I can almost bench three plates, now. If it's just your shoulder, start with that. I used to hate the isolation machines, and figured they were just for women and faggots. But after a while, you start to see their value. Especially when it comes to breaking through plateaus.