Personally speaking I would actually set the rear diff to be quite free (but not free spinning), and the front diff a little tighter. This is on the basis that neither slips under load.
This maintains good traction and stops the car grabbing too much on turn in.
Whenever I see cars with tight diffs (especially at the rear), they tend to be a handful.
Ball diffs are barely adjustable in practice so I just set and forget - helps to get the slipper setting right to protect them.
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