Narrow bench press grip, stop at the 90 coming down, and don't lock out at the top it spreads ac joint. Definitely no dips. I have researched this for years.I had a resection on my left two years ago, it worked great. But my right is acting up. Even with modified lifting i think you must back off on heavy weights unfortunately. Military press , i have absolutely no pain doing,my best lift. Pretty much, if it hurts it is doing more damage.