Speaking of MT tires, I did do some experimenting with balancing a while back and posted it here:

http://www.rcuniverse.com/forum/m_97...tm.htm#9769911

I'll probably balance in the future, but just to equal out tires, rims, and foams as best I can. I'm not going to go the extent of adding lead again unless the wheels wobble when the vehicle is on the ground. If they only wobble when held up in the air, I think that's close enough for me.