Again im no expert but
Id go for
Build diff's - tighten until they do no slip in yr hands - hold a tiny screwdriver through the slot in eack diff halve (outdrive whatever u wana call it) hold the drivers flat on a table - diff hanging over the edge - then tr to turn the diff gear - if it moves tighten it...
Shove it back in the car - hold one wheel an blast the other - check diff it will be looser - so tighten a bit
Good check whilst in the car is to lock the wheels - try to tun spur with yr thumb - if the spur slips in the slipper then the slipper will slip before the diff does when driving...
I doubt the diff has much to do with it slipping on sand on a track - at a guess id try removing the rear anti roll bar you said you are using - may help a little
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