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Like I said, I don't have experience with Boxsters, but have many hard track laps on my A4 that have taught me a bit about hard brake use. I'd be surprised if there was a problem with the rotors themselves. It is certainly possible, just not what I would look into first. For what it's worth, I've been using Zimm x-drilled rotors for five or so years, in conjunction with Pagid Blue and Ferodo DS2500 pads and have had zero problems with the rotors.
I know it can be hard to find a place to safely bed brakes, but before you spend any money or start taking the car apart, it would be wise to re-bed as a first step.
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