The diff setting is a sure fire way of ensuring people don't set the diff too loose, causing damage on the first run. Suggesting that people set the diff by 'feel' will be very different from customer to customer, and it will lead to a lot more problems. Up until recently I always set my diffs by tightening them fully, then backing them off 1/8 - 1/4 of a turn. Now that I know how that 'feels' I can be confident of setting them without over-tightening.
With regard to the drive shafts, it looks like you've got one old and one new. The original drive shafts had a slightly longer thread, which was then reduced from the second batch onwards. It will have no effect on the car and I would just use a serrated nut with it like you would on the short side.
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Yokomo - LMR
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