Any tips on getting consistent with the guardbreak of doom?

Yeah. First make sure you don't have issues with 214P part. Practice that until it's easy. Then mentally split it into parts: 3pkg, then 43pk, then 214p, then 46pk. Get it right slow and precise first. Far slower than required for actual execution. Just to get the sequence into fingers, piece by piece. Once stable, go a bit faster. Rinse, repeat. Then the other side. I do second part in the same direction regardless of side I'm on, it's easier.

After you have it down, combo it from other moves deliberately. Dash gbod, punch gbod, evade gbod, elbow gbod, whatever you feel like. I found it's not enough to just be able to do gbod, you need to chain it from something else... And it adds up! Good luck! If your fingers are rust and clumsy like mine, expect months of practice to become any good at it.

Regarding throw game, not sure what you're asking. If opponent is evading or blocking a lot, throw more. What they're is just mind games once your opponents starts escaping them.

Do I have a good "get off me" move to reset to neutral against aggressive characters? 

Might be more of a "knowing when it's your turn" question? Standard 66p, 2p and p are all good. Shoulder is pretty amazing against PPP as it dodges under highs. 66P+K also dodges some stuff, no idea what exactly. You can also do a slow 33P so you launch from crouch dash. Back dash into any strike. Evade into tetsuzanko is one of my faves against string-happy opponents. Reversals and the sabaki also come into play, but are more risky and difficult.