My actual routine right now is
4 sets at 12,10,8,8

Bench press
Incline Dumbs
Flat dumbs
Pullovers
Cable flys
Dips to failure x 4 sets

Right now I'm supersetting ever chest exersice with a back lift. One of Arnold's old routines. I find that if you add 10 or so lbs to your start weight after each set, it works out pretty well for the rep range I'm hitting. Not to failure, but I'd say high/moderate difficulty. I try to take as little rest as possible between sets. 2 times per week. 3 day split for 6 on, one off.

I was doing 5x5, heavy, but my wrists and shoulders were really starting to bother me, so I bagged that.

Try doing some giant sets. You could do pullovers with dumbells flys. Or dips with cable flys. Whatever you want, just play around with it. Incline bench press hurts my shoulder, but incline dumbells don't so much so try that. As others have mentioned, focus on squeezing your pecs at the top of each rep. When I giant set pullovers with cable flys, and really focus on that flex at the top of each rep, I get a real nice pump and it feels great.
Another thing you could do is isolation. For instance, they say the bottom 1/3rd of your bench rep is mostly pecs, and the top 2/3rds of the movement are shoulders and tris w/ chest. So try busting out some reps but only go a third of the way up or so. You can do this with almost any chest exercise.

You could adjust your grip wider on the bar on bar work too.

21s are great too. That's where you do 7 reps full movement, 7 reps 2/3 movement, and 7 reps 1/3 movement. All non stop. I'm sure there are other variations, but that's how I usually do it.

I had a shoulder injury too, a few years ago. The thing I noticed was I was adjusting my form because of the pain, subconsciously. So watch for that.
Good luck, have fun!

I know this is already a couple of months old, and you've probably heard this before but I remember that where the bar crosses the body ie at the nipple, at the bottom of the pec or just below the pec utilizes a different "portion" of the muscles such as more or less tricep, bicep or pec. Also, whether you lock out, don't lock out, come into contact with the body or stop short of making contact will target a different section of the primary muscle group used in the compound exercise. I've come across this information often but have not developed to the point where I am able to differentiate one from the next, right now just worried about getting the weight back up to the rack. Hope it helps, bit it looks like your already hitting every area of the pec through the different exercises,