Looks like you have what you need in there.
To be honest it's probably time, food, and patience that you'll need.
It's my observation that most people that get strong in any type of upper body pressing exercise use heavy sets of 3-8 reps, swapping reps up every once in a while, taking long but reasonable rest periods between sets, and only massively swapping things up when progress stalls for more than a couple sessions.
I'm using 3's, 5's, occasionally a high rep all-out set when I'm not feeling the heavy weight, and lots of eggs, milk, and the rest of the good stuff.
I should add that I'm right around your strength in overhead pressing. Push pressed 185 two weeks ago when I tested it.