[smallblockhead]

Allen,
I'm using the ERA recommended 4.5 degrees caster, I haven't played with the caster at all. Less caster, as I understand it, will do two things: it actually makes it easier to turn the wheel at slow speed, but it reduces high speed stability in a straight line (twitchy steering).

I think that caster also adds negative camber to the outside wheel in a turn, which is a good thing for autocross. I run as much static negative camber as I can with the stock ERA front suspension, which works out to be about -0.8 degrees, and have used -1.5 degrees in the rear.

I've set a very small toe-in up front, and zero toe in back. Some recommend slight toe out for autocross for improved turn-in, I have not tried it.
Gary