One thing you made need to be aware of is braking duration. When I tracked mine way back I was too long and smooth right down to the apex for these brakes so they would get hot hot on a technical track. This is with GT3 ducts.
Try reducing braking duration by going harder and shorter (while still being smooth) so that they have more cooling time to recover. Easier said than done I know and I would not be able to do it now...
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