Maybe that is to much training for you.I do less volume in my chest training and mine have responded well.i typically do flat bench ,incline bench and flys all for 3 -4 sets.Like already suggested experiment a little to find what works best for you.
less volume a bit more frequency.
focused on the most basic lift that also allowed me to lift heaviest weight:
those two exercise with heavy weight and moderate reps like 6-9 rep range helped the most. and i was not genetically gifted in chest area but training it this way made it grow the most.
THere is no such thing as growing a certain part of a muscle. You cant develop upper or lower chest, upper or lower abs, etc. Example: When you do crunches you are not just working your upper abs and then need to go do leg raises to work your lower abs. They are all being worked with the same exercise. Same as chest, you cant develop the upper chest and not the lower or visa versa. The entire pec muscle is being worked and developed. THis is why you should choose the exercises that work the specific muscle the most efficiently. Decline and dips are the best for TOTAL chest development.
Honestly, try the decline dumbbell press. I find that doing this exercise allows me to easily place tension on my pecs and KEEP it on there. With flat and especially incline, I find I take the tension off my chest accidentally a lot more often during the repetitions. With decline, the range of motion is really limited but it's ALL on your pecs. So you can be a lot more explosive without sacrificing form.
drop your total sets, add weight and keep reps in 6-10 range.
if I understand correct you are doing 4 sets from each position, which is giving you 24 SETS, that is 3-4x what you need.
switch to 4 sets flat bench(barbell or dumbells), you can switch angels every 4-6 weeks. replace the flys with dips at 4 sets until faliure, adding weight if you can do more than 12(can replace 2 sets with 2 sets of flys if you are hell bent on doing them).
Are you trying to lean out? If not add in some fats and red meat, greens, fruits,
you are only eating slightly over 2k cals.
what is your age, height, weight, goals, and yrs of training?
Like a few others have said, I never was gifted in the chest department and I never started noticing growth until decline/chest dips were thrown into the mix. Before those, I was doing flat, incline, and flys, which never really helped too much. Inclines slightly, and I still throw them in with my chest routine now for some variation (since I'm doing DC, I don't want to do decline and dips 2x a week).