I’ve done this exact thing, and ID the diff stiffness by the number of washers I use on the diff screws. 4 screws in the tightest diff with Bad Horsie diff grease, all the way down to no washers in my loosest diff.

Its a pretty obvious difference between the tightest and loosest settings but it keeps the in between settings in order.

But since getting an XV02, I’ve been getting more oil filled diffs and using the different XV02 diffs in the TT02. Even the 40T diff in the rear of the TT02 feels pretty good (to me at least).