Actually if it's the rear-end that's sliding around you could always try decreasing your rear tire pressure by a couple PSI and see if that helps at all. I know it helps with my drag tunes! :D
Re: 2012 Mustang Boss 302 Laguna Seca quickest in class for Car and Driver’s 2012 Lig
Love it! I'm a huge Boss fan. As much as I like cars with crazy amounts of power, it's the ability to handle well around corners that will win you races as well. :D