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Not sure if you all are aware, but the STi swap actually makes the bias issue worse. Adding the rear STi calipers helps a bit, but you guys are shifting bias further to the front on a car that is already heavily front biased. This will not work well on the track for sure, as some have already experienced. BRZ's do not work well with heavy front brake bias... keep in mind the BRZ has better weight distribution than the STi (closer to 50/50), and much lower curb weight, so not nearly as much weight shifts to the front wheels on the BRZ compared to the STi.
STi rear calipers actualy have less mechanical advantage (smaller piston size) than OEM BRZ calipers. STi front calipers have more mechanical advantage than BRZ fronts, which is only exaggerated with the larger rotor size.
Your best bet to try to remedy the situation is to use more aggressive rear brake compounds vs. front, or get our Front/Rear BBK's:-)
-Rafi
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