Warped rotors "normal"?

Push370zzz

So a while ago I bought a set of Stoptech slotted front rotors for the sport package. I did two track days on them and they were fantastic. Today, I was at the track and while bedding in a set of new pads (before I even had a chance to go out on the track!!) it starts shuddering like a ************. I thought I warped them and swapped them back to the stock ones...which I thankfully had with me. I loved these rotors and the price was great, but should I seek a replacement set or is this common? If this is something common I'm never going to buy them again considering they warped so easily, maybe I had a bad set. So anyways just looking for you guys' experiences and advice.

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Range Rover Sport Supercharged
Nissan 370z Touring + Sport

Modshack

Sounds like Pad transfer, not warping. Stoptech has a tech paper on this here:
StopTech : Balanced Brake Upgrades

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Push370zzz

I actually read this before posting, and am fairly certain that is not the problem. The front wheels would not spin freely at all when the car was jacked up, and when accelerating quickly the front end would start to vibrate violently, as I would expect if the rotors were imbalanced...

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Range Rover Sport Supercharged
Nissan 370z Touring + Sport

AP - Chris_B

Were you bedding the same pad compound or a different one? If different, did you remove the old pad transfer layer first, or just try to bed the new pads over the old pad layer?

Chris