Here in the Netherlands the tracks can be killing.
Last week I was at the Dutch/Belgium nats, and the track was treated with soiltack.
Grip was awsome, unlikely what you would expect. And that would be low grip dusty blown out.
Controlled tire was the proline caliber m3 or m4. So i was preped for the worse.
But with that soiltack I was on rails but it ate my tires in a few runs on the downside.
Normaly such track without the soiltack is a holeshot or double dee the better tire.
in the morning its damp, cold and soft, in the afternoon its hard as concrete, dry hot and almost blue groove.
And in between when the track is drying up there could be no grip at all. Jumps are covered with carpet to prevent eroding,
but has a complete other grip level then the hardpacked dirt. Tricky :-)
And in 99% the front tire is always a "rib" kinda tire.
Id thought to try something else for the "afternoon high grip" situations.