Try dips. I did almost everything else for many years. I avoided dips as I gather they can damage your rotator cuffs. Then recently I tried them and they built muscle on my outer pecs way faster than anything else.
But be careful - use a machine to start if you can, warming up with low weights and stretching. Stop if you feel pain in your shoulder joint when using a heavy weight. I understand rotator cuff injuries can be slow to heal, so don't risk it.
We are all built differently. For example, dumbell raises with arms straight in front are usually done for front delts. For me they are best for building my upper pecs - much more than the incline presses which are the classic exercise for that. So I suggest you try a variety of exercises and see what works for you.
