Norman,
Rutted roads are the nemesis of any car with wide tires - especially Vipers and Lambos. The more negative camber you dial in, the worse off you will be because of a phenomenon called camber thrust. I'd say you have these choices - 1) find alternate routes to avoid some of the worst roads, 2) keep the tires near 0 camber and 3) straddle the ruts instead of tracking in them.