moch.. ya go to the green front and try that too..... I have mine all set up for outdoors and its really good. But I like a very aggressive car so I know my setup isn't for everyone.. have you done the rear end mods for more traction? either taking a mill off the front of rear arm or using b5r rear arms? I also use the 30deg. caster block as well.
if your indoors or a hard outdoor track with traction then keep the heavier front spring and also go to a white rear spring.