Dave, you should be able to build ball diffs to the point they spin as freely as a greased gear diff and not slip. I normally leave them a little loose at first, run the diff in by holding a wheel (car off the ground) for a few seconds then setting it by feel (so when holding 1 wheel and the spur it is not easy, but not impossible, to turn the other wheel). After a couple of runs like that I usually have to adjust them but then they should run for ages as smooth as you like.
Hope that helps.
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