I can't really make out what you are asking, either it is because it is late or I am a tool
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What do you think of trying:
Incline work
Seated D.b press or OHpress 2x8-10
Dips 2/3x6-8
Skull crushers 2/3x...(Keep the rep range you have if you are progressing in it, if not switch to another rep range or a new tri exercise).
I would definitely put bi curls in if they around that level. Mine are really low as well, at the point where it can only benefit me adding them in. Bi's play a role in bench too and for all you know that is what is holding it back
. They are surprisingly low considering 400x5, just to point it out.
For the skullcrushers look at what I posted in Johnny's log about going up to 12 reps and then upping the weight. Not sure if you tried that already or not.
Btw, once you start slowing up on deads and squats, it would probably be time to look at Westside perhaps. As I mentioned above this is what I am aiming to do, although I am not 100% sure on the logistics yet
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Congrats on the dead btw.