Thanks ... experienced similar problems with Much More 32 on Friday night, but not as bad. So I guess not a tyre issue.
I am using the middle hole on the rear hub (and lower inside hole on the shock tower - as per kit)..... which are you using ?
More rear toe

I should have thought of that ...will help.
Originally Posted by
Atomix
If it gets worse during the run, your tyres may be overheating. Im not terribly familiar with the Xenon tyres, but would suggest you try a Sorex or Much More tyre to compare. If its still doing it, at least you know it isnt tyres.
To get a bit more rear grip you could also try more rear toe in.
What hole position on the rear hub are you using?