Little Stampy,
Very good description! Perfect for new guys who want to learn the basics of how the diffs work.

FYI:
I have one of those buggies and had one of those buggies you describe. I followed the typical diff theory for years and had some success. But, what I have found is that Some Hyper buggies have benefited form running a thicker oil in the rear, even with it's lack of steering. I've seen some way out setups and they seemed to work.
So I think the rear diff is kind of starting to break the mold a little on certain buggies.