[Speedfreak]

I can stop by as well. Can help with the hood, and would like to see the disc and pressure plate. I'm guessing the distortion of the disc (and friction discs on the disc) is likely the issue. It doesn't take much variance in thickness(including overall "thickness" caused by warping..) of the disc or cut of a flywheel for a setup to hangup or not fully disengage.

The heat spots on the pressure plate indicates this thing isn't disengaging, combined with your last day at the track..