You should stay with your ball diff. It is much better than gear diffs in slippery conditions because the ball diff has much more traction when accelerating.
In general I think that your car is too light. I understood that you don't have any additional weights? I would add 50 grams on front axle.
And you should try less anti-squat on rear axle. That means that you have to reduce the kick up angle of the rear wishbones (they should be nearly parallel to the ground). This will keep more weight at the front axle when accelerating (= more on power steering).
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