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What pads are you on currently?
Pretty strange for anything to have been damaged. I've tracked stock pads on many cars that come with much worse pads than the BRZ/FRS stock, and even caught a set of HPS on fire. After cooling off and driving for a bit they went back to mostly "normal". I'd imagine, as you said, they may have glazed a little but nothing that won't go away after some driving. At absolute worst if you need it fixed immediately you could turn the rotors to remove that glaze, or replace them.
Typically on vented rotors, they feel "warped" as between the vanes in the rotor there is a difference in temperature on the surface of the rotor because of airflow between the vanes, and because the areas with metal are a larger heat sink vs the vented areas. Therefore, because alternating areas hit higher/lower temperatures, they "glaze" before/after one another resulting in an alternating level of friction, and thus a "warped" feeling.
End-all, be-all I've used is Raybestos ST43 or ST45 compound pads. Ran them on AP calipers on my S2000 and they stood up to Sebring/Roebling with no ducting (paces were 1:21.1 @ Roebling and 2:33.5 at sebring). Sebring has multiple braking zones that are exactly what you described as you can see in my video https[:]//www.youtube.com/watch?v=QPaLiJtazbA. The power levels are very similar to a BRZ. and braking setup probably isn't a whole lot different with the AP calipers. The same pads _worked_ on stock calipers, but large calipers added a ton of life.
I'd imagine anything in the neighborhood of ~800°C for upper operating range is going to be comparable, and probably overkill if you are simply looking to make one or two high speed stops from the speeds you mentioned. The fact that you're on 50tw tires makes me think you might demand a little more though, idk... If you wanted to test it, you could replicate the stop with some temperature indicating paint or strips to see what upper temp range you'd need to tolerate stops like that. Though, you'll probably hit an equilibrium at some point where the pads simply won't provide any more friction, thus they won't transfer any more motion energy to the braking system as heat (fade) -> temp won't rise any further.
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