Looks like your a shoulder bencher. I've worked out with a lot of really strong guys, some had huge Chests, several were just as strong, but were.concave in that area, whilst having killer shoulders.
I would try to arch your back, roll your scapula back and stick your chest out, also try inhaling in on the.negative, which forces.you to hold a better alignment. I'm no world record holder, but Chest was always one of my better bodyparts, I won several Bench Meets years ago, after I started training with an old PowerLifter, he taught me to integrate other muscles to lift more weight.
My point is that I had become so used to channeling mostly chest, because I was a bodybuilder and was capable of lifting a lot more weight, but didn't as it took emphasis off my chest, and I knew it, because my shoulders, Lats, triceps, etc never really got sore, just my pectorals. I had gotten talked into the Bench Meets by him, and subsequently saw just how different lifting weights and bodybuilding are.
Not to get off an a tangent, I think your using your Lats and shoulders too much, its evident, I can't critique your form much without seeing it, I'm just pulling on years of doing it, and seeing that sort of thing.
yeah id like to know how a typical chest day goes for ya. you def got some size. it might be an anatomical issue. basically what TB was talkin bout. the way your shoulders kinda come forward and take over. if you can find the right posture to take them out the game you could do some damage. id also say unless you havent done much flat benching at all your entire life, id steer away from that as well. your lower pecs are there. get an adjustabel incline bench and lower it all the way down so its a slight incline. get ya some dumbells and go to town. arching the lower back and keeping elbows slightly bent to get a deep stretch. or do smith machine with same angle on bench. this again should help keep shoulders out and trash the upper chest which seems to be your weakness. exp with grip width. markus ruhl use to do these as wide as your hands can go on smith. i tried it and was sore something fierce for days. after youve done one of these two exercisess first, go straight into incline flyes. its all about where you position your elbows and the bend in the arm to get that deep stretch that is the main reason for flyes. try to feel the fibers. from 3-4 workin sets here id hit a machine press then cable crossovers and bounce brah! hope this helps and goodluck brother