Dean, there is a big sticker on the Axxis Ultimates that come with the StopTechs that reads "NOT FOR TRACK USE". They will fade at high temperatures. And on smaller brakes like the stock WRX ones, at track temperatures they will turn into charcoal and you will wear your rotors instead of the pads. I've still got my rotors that were destroyed at Reno-Fernley if you'd like to see em.
Also, stick a feather in *my* hat since I've never heard of Fedora pads... just the Ferrodo ones that Matt's got.
Finally... did EBC change their Greens, or do they still put cracks into rotors?