Also why are you doing legs by themselves? It seems like you are overloading your upper body day and underloading your lower body day.
I would also go with 20 rep squats for legs, they are brutal and effective. Why stay in the low reps when your goal isn't more power for now?
I would also incorporate deadlifts, standing shoulder presses/dumbell presses,and bent over rows into your program.
I would also get away from the machines for your triceps and go with free weight compound movements. This will help to get that bench up into the stratosphere.