Hey Tyler check out this page as well. Its written for 1/10th offroad, but the same principals apply to a 1/8th buggy. Its got tons of really good stuff on it, chassis tuning, driving tips and such. What oil are you running in your centre diff? going to a lighter oil may help, something in the 5-7k range is generally good.
http://rc10gt.home.bresnan.net/index.htm
btw- This is WheelNut