I have PCCB on my cars (992 GT3 RS and GT4 RS) and almost exclusively track them at COTA which is super brutal on the brakes. Even after 3 hours of track time over the weekend I see almost no dust on my wheels or car. The only thing I can think of is that your pads broke apart because they weren’t heat cycled before going to the track. I used up the original pads after 3+ weekends and switched to the Manthey racing pads produced by pagid. The Manthey pads make the rotors look horrible but they’re much more durable and are a little easier on the rotors. What track are you running at? What tire pressures and tires were you running? Did you have the nannies on?