Hiya,
I've been running on slippery indoor surface (polished wood) so far with a gear diff. I went down to the 700 oil usually used for shocks. I've had no problems and may even run it at 600 if need be.
This loosened the diff up more for low grip fine. You cannot go too light though as you may start damaging the diff, I've heard, so maybe go down in stages if trying it out.
Hope this helps.
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