[jphughan]

A soft brake pedal after a few minutes of hard driving implicates the brake FLUID, not the pads or rotors. Inadequate pads or rotors (in which case carbon ceramic would be the fix) would be indicated by increased stopping distance at maximum braking pressure after a while compared to a baseline stopping distance at maximum pressure -- but that's impossible to confirm if the brake fluid boils first, because that reduces maximum possible pressure that can be transmitted to the pads at all, in which case increased stopping distance could be caused solely by the reduced pressure being transmitted to the pads, not necessarily the pads and rotors being overheated.

I'd be curious to know what would happen just swapping some Castrol SRF in there. If you do that and THEN you get brake fade, then that's the point where you either need carbon ceramic or an aftermarket BBK. But if the fluid is boiling first, then considering upgraded fluid is a pretty cheap and quick fix, I'd be interested to see how the brakes hold up after that upgrade is in place.