Well, that recommendation was for the balls to sit nicely into the grooves of the Diff Plates. That's why they recommended users to run a few rounds before tightening.
You can use that old recommended method or ours. It's the same. See what your preference is.
I use Tamiya Diff Grease, and only very little of it. Lubricating it with lots of grease isn't the cleverest idea.
Alfie
With the older pan cars it was recommend that the diff slip for the first foot or two. What do you use for diff grease?