I had the same symptoms on this kind of surface, losing the rear on nearly every damn corner. Standard asso V2 settings : 35wt front/30 wt rear, pistons 2. I tried these changes :
-saddle disposition to stick
-replacing brass bulkhead with standard plastic
-shortening wheelbase by changing rear hub position
It went from horrible to bad. Strangest thing is I won two months before on the same track with the same setup, only this time it was much colder. I didn't know it could change grip this drastically.
Do you have any idea what I should have tried next? Maybe it would help trevpotter too.
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