Hey yokemad,
the key to a free car is pretty simple. The Mi3 is naturally a very free car.
I made the following enhancements to mine:
1. Remove all the belt guides off the pullys/Diffs.
2. Use the Grey Mi2EC belts front/rear
3. I run the belts alittle loose
4. Use light oil/powdered graphite on the CVDs
Hope this helps!