highwayman- the LRC on the front achieves more steering in a different way than kickup; LRC allows the front end of the chassis to roll more, increasing front grip/steering. on carpet, you are running on an unusually smooth and consistent surface, so using kickup doesn't really work to the car's advantage. my best advice is to try achieving your desired caster in both approaches (ie a 2 kick and 4 caster and a 0 kick and 6 caster) and see which yields you the fastest (and CONSISTENTLY fastest) lap times. that is what i have done...