I use really thin grease. This is going to sound so cheap. (Well yes I am cheap
) I use trumpet slide grease. Although I don't play anymore I still use thre grease on my cars. The car seems to run really well into and out of the corners. I got a track recently and was able to really test the F1 and see what it could really do. So I oiled down the bearings and greased the diff and the car FLEW!!!! So maybe you can go out on a limb and try the redneck way. Or just buy a bunch of different greases and try all of them. Your bound to find one that works for you.
LAST WORD: I really like the thinner grease. It protects from binding and it isn't thick enough to take away power.