Well done on the protein intake, not many manage that lol.
To be honest with you, I found db's worked up to a certain point, but progress slowed. Went back to bb in the end, except did decline variation instead of flat which was better for my shoulders. Incline's fine for my shoulders as long as I don't go too far down. If I were you, I'd still stick to movements where you can progress in load decently (e.g. the machines if not the barbel).
Some people need more work/volume for certain bodyparts and it may be the case for you with chest. I wouldn't worry too much about doing anything fancy for it other than adding in extra sets/exercises. So, you could do say a range of 8-10 reps, 2-3 working sets (near failure on first 1 or 2 working sets, then failure on the last), and/or do an extra exercise or two for it.
A few extra reps often helps with mind-muscle connection. Learn to control the load more, especially on the negative - if this means taking some load off then so be it. Movement should be piston/smooth like a machine (no jerks/pauses or loss of tension)...in fact, make sure you do all this first, then if still a problem, increase the volume.