Aside from the torque thing, rotor warping has a lot to do with the inital quality of the rotor and how long the iron is allowed to cool when the rotor is manufactured. I don't know who Powerstop buys their blanks from, but if they're low-quality Asian imports that could be the root of the problem. I've had good luck with Canadian-made Brembos and Eurorotors on my other toy, a '93 RX-7 R1. Unfortunately, neither company has an application for the stock SVT front rotor, but you can get Brembo rear rotors for your SVT. If you want to pay for cryogenic tempering, that helps. You can argue whether it's the -300 cold cycle or the heat-tempering that follows, but I've not had cryo-treated rotors warp yet.
