Dan, if positive camber stops traction rolling on ANY surface, please show me which professional racer uses positive camber on ANY of their setups. By ANY, I mean on road, off road, 1/10th, 1/12th, 1/8th, buggy, truggy, monster, stadium truck, electric or nitro. Nobody runs positive camber.

You want a proper contact patch.

Have you checked the outsides of your tires - to make sure that they are still well glued? Do they make sway bars (Or can they be adapted) for the Rustler?