Yes, I can imainge that the warping would be an issue. My wife's malibu (same N-body as the grand am) has terrible brakes for the size of the car. I have tried many different pad and rotor combinations, but they don't stop well, and they are very prone wot warping. I am surprised that the current ones have been on almost a year and just starting to warp. Best ones I have found so far.
But in no way am I going to DOWNGRADE...yes, downgrade to thinner, smaller brakes. Just aint going to happen on my DD.
I know some do run these, Ron being one of them. And more power to him. Just not for me.