maybe u could try supersetting db press/bench press with dumbell pullovers after ur first power movement since u cant go as heavy..this is to hit the muscles from different angles(muscle confusion?) forgot the exact term..

next u could try flyes with machine presses..flyes are more to iso work(less dependancy on other support muscles during the movement), hence when u move on the the machine press ur chest muscles are already pre exhausted..once again forgot the exact term

i meant after ur done with ur first exercise

for the 2nd exercise maybe u could try supersetting the press with the dumbell pullover..its like causing the muscle to think "what is going on?"..from a press straight into a pull..whenever i do this i can really feel a nice pump in my chest