I switched to the battery back, electronics front setup with the 574/579 combo on carpet. These tires are awesome right out of the package. The car balance was excellent and consistent. Only my lack of practice is letting me down. I used SXT 3.0 for traction compound, full rear, 1/2 fronts. The car had just a little buildup after the run, but much less than everyone else. I felt much more in control yesterday.