It's just that a little toe-out can make the car feel really twitchy at high speeds. Increased castor makes the car want to keep straight. It really depends on whether the car is really just carving up corners all the time, if so keept the toe-out, if its going fast in a straight line a lot, you might want to keep the toe-out to a minimum. That goes with camber too, if you are always cornering, you might go up to 2+ neg degrees, but depending on what your sway bars are doing, you might not be getting the roll to need that much camber.
Jason
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