Not sure your experience with wide low profile tire wheel combo but especially side to side the road tends to pull you around quite a bit because you have so much tire physically on the road coupled with the very a short small sidewall. Try running max air pressure in the on a new corvette or viper and take it for a quick run down a heavily rutted interstate its alot to deal with. Im pretty sure if the dealer was able to give you a set of 18 or 19in rim/tire combo your problems would not be happening.