Redsand: Usually we set the car up as close as possible to perfect. The radio becomes fine adjustments. EPA's are usually as high as possible, with EXPO's adjusted according to track conditions (loose track, adjust either the throttle (smoother throttle) or steering (not as much throw or speed).
Most of it though IS personal settings. My of my cars are set up to be somewhat smooth into corners. That let's me drive them harder than normal, if I need to. Others set their cars for aggressive turn-ins....allowing them to be aggressive ALL the time. I'm not that quick with my reflexes anymore to try to drive (competitively) cars like that!
Oh, ya, ran a 7turn brushless motor in my TC3 this weekend at the Camarillo HP race. Ummm, REALLY fast....