2017 infiniti Q50 AWD
Doing 140-0 with a 4000lbs vehicle is going to generate a lot of heat in the rotor, doing it a few times I'm not surprised they started to warp. Sounds like you need a good BBK.I do not solely blame it on the the rotors, But the rotors warped and had heat markings on it. I cannot seem to find a pad that suits me, having already tried 4 different pads/rotors.
Do you know the diameter and thickness of your SP P SDR?