You need bench volume. I'd stay away from dynamic bench work if I were you. It's not gonna help.
Look at a bench routine by Vladimir Volkov. There's no rhyme or reason to what days to train on, but the progression of it is what's important. Try and hit the rep scheme that day. If you come to a jump in weight that you know you won't get for the rep scheme that day, just stop there.
And only bench....for a little while. If you want your bench to go up you need to bench more often. Lay off the assistance work. Don't max out, just work up to a heavy 5 or 3 or double or whatever you do that workout.
This progression works! I still use it.