Are you running a geared or ball differential?
I've been using a geared diff on high grip grass with 1,000 cSt oil and it's been great. But I was in Oswestry last weekend and the grass was destroyed and became a hard, rutted, dusty low-grip surface. I think the geared diff became a disadvantage on that surface.
I noted that two of the A finalists cars had their ball diffs running very loose, they could be heard slipping on the higher grip areas of the track.
Can you offer any words of wisdom about the two different diffs?
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