My arms and delts are prob my strongest/best developed parts....my chest lags though. I tend to stick with more dumbells for my chest days and try to go slow and deep. Flat barbell press has always hurt my shoulders no matter how heavy or light. I did chest yesterday and DB pressed the 130s for sets of 8 clean reps (no Cswol reps) and after that did some flat barbell and even 185 hurts. DBs are my bread and butter.
It's made good progress over the years but still a tough bodypart. It's AKA Evan Centopanni Syndrome. 
It's good that you know what works and what dosen't for your body, most people would just stubbornly bang away for years until something gives, you have shoulder pain when doing Barbell bench so you stick to dumbells, that's smart training.
Have you tried dumbell pullovers for chest, they were my favourite chest exercise in the past, after my compound movements (flat/incline press)
I would do 4 sets of 10 and they would just blow up, also I believe they were a favorite of Arnolds and the other bodybuilders of the era, I haven't done them in years since switching over to powerlifting but I always recommend them to the younger BB in the gym, very good exercise.
