OEM Brembo's should be fine, a nice 332 or bigger BBK would be fine and fit under your stock 17's , probably with minimal spacers.

 

"the z's front calipers are located in front of the axle does this just mean the car toes in under brakeing"

Where the steering rack attaches [tie rod ends] determines toe changes during braking and acceleration.

 

Considering the pressures/heat they're getting, they're performing fine, dude!
Bottomline: 1. Get even better quality rotors/pads. 2. Slow down, kid! Human
lives are at stake here; join your nearest track club, & knock yourself out
there, & not anywhere else. Save gas in the process, too!