Todd Serota, the guy who runs the Tracquest Drivers Ed events posted what he thought to be good SC alignment specs on the Rennlist 911 mailing list a while back.
Quote:
Re negative camber, if you want to reduce understeer, use the same
amount of negative camber in the front as in the rear. 1.5 degrees
negative is an aggressive street setting, which I recommend, but it will
cause some premature wear on the insides of your tires. If this is a
concern, use 1.25 degrees negative all around. I run 2 degrees negative
all around and I definitely suffer with premature wear on the insides of
my tires because of all of the street driving I do.
Re toe, you're not going to like any toe out in front on the street.
Even 0 toe can be a bit annoying, depending on the kinds of roads you
have in your area. I run 1/32" of toe-in in front, which is very
livable but still provides great turn-in. In the rear, 5/32" of toe-in
seems like a lot. I run 1/16", which I think is very common on 911's.
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If you changed the ride height, you probably changed the toe, by changing the angle of the tie rods to the steering rack. If you managed to get some toe out, that could explain the twitchyness.
Tom