You could also fabricate a brake cooling kit
Just get some flexible HVAC tubes to channel air to the inner wheel. It can greatly reduce heat soak.
I do not own a Z yet but on my current car I have this setup because I drive down a super steep moutain for about 15-20 miles every week-end and my rotors seem to handle much better. You can even have the air be channeled onto the rotor but that will affect many things.
Surprised no one has mentioned this!
I have a question actually. is there a short tube stillen setup? i see the pipes come in two pieces. Like dual SRI's?
Another thing you can try is get a beatrush under panel. It reduces engine temp and increases downforce by pulling the air out of the engine bay depending on your speed. this could also take some of the heat from your brakes and suck it out before you hit the brakes. the only problem with getting the underpanel is that if you have a brake cooling system it might suck out some of the air being fed to the rotors, inner wheel.
just some thoughts,
Regis