I am currently running the new US buggy setup. We use almost no weights here in the States. I had my buggy with all the weight and it handled good. For me it just seemed a little slow on the acceleration because of the weight. This new US setup I tried worked great last weekend. I TQ'd but finished second in the main. I made a few tweeks to the setup (moved rear hub back and front shock to inner hole on the arm) and the car rotated and got up to speed quickly. It was by far the best car there but my driving left me. Give this setup a try and see how it works. Try this setup and if it pushes make the changes I mentioned above.
http://www.xfactoryrc.com/rc/pdfs/Se...-2009-X6Sq.pdf