Probably not here...
I dunno how competitive the GTI could be in STX in the light of the twins, RX8 and lighter FWD cars like the Mini.
I got to play around with a STS CRX this season for a few events and we've also trialed both tires and feel largely similar(my co-driver/car owner does, I am just there to spin the car...lol) as your note. STS cars are a different animal compare to GTIs haha...