I've driven a car on track with 330mm 8 pots,
They were perfect! really very good!
I find the wheel bearings on the 100X5 pcd cars seem to give a tiny bit, eg. My 355mm porsche 6pots are savage but after a few hard corners, the pads have worked their way away from the disc slightly! because the big disc shuffles around ever so slightly, so the smaller the disc, less the effect!!
Dan