[tonythetarga]

What kind of pads are you using? It is not easy to warp a Porsche rotor and it likely has pad material transfer. Try using a different or maybe slightly more aggressive pad and do a series of progressively harder stops to clean the rotor.
I agree that turning the rotor is a bad idea, just replace it. Turning it gives you less mass and a decreased ability to dissipate heat and that WILL be a cause for the rotor to warp or for you to have brake fade from overheating your pads and fluid beyond their specified heat range.