Ahhh...Sorry no knowledge of the track tyre. But the seat's at knockhill all came with the Kumho's and the grip levels were Really poor!!! And they were going off after 6-7laps!!! The side walls were cracking too. Pressures were fine too.
The new ADVANS's are a sensible priced tyre 80£ i think and simply awsum, tried them a couple of wks bk!
Yoz i understand where your coming from, but i just don't rate them, If your gonna spend money on performance, i'm sure u'd be first to agree that you can't cut corners. Tyres, are the base building block of overall chassis performance.
Ali