Brushless Baja !!

Bought off a fellow Tamiya club Member Taffer !! thanks, got it at a bargain price with C/C esc and 5700 Brushless motor. I really only want the motor for my Traxxas Slash when I get it, but thought I would get the Baja together and try it on a 3 cell. Well its just too much cant keep it in a straight line, maybe roll bars might help but I think its the tires flaring out as well as the soft suspension, plus it got a bit warm and cut out on me a few times, think to be honest a 2 cell would be better.