whats that in shore rating.
on low grip carpet i use 40 shore front, and 35 rear...and i mean low grip carpet, it is crap.
but then again on some new carpet at the other club i use t27's, i prefer them to foams. as witht he foams you get waaaay to much gripa nd even wit a hard setup it rolls quite a bit
foams only seem to chucnk if you use soft foams on high grip carpet, as your get a lot of grip and tyre fold (causing them to rip)
i would try some softer foams, if still not much grip use some additive.