CASTER: 5.5deg positive, - have run up to 7 deg positive.
CAMBER 2.5 deg neg for tight autocrossing
toe set at zero.
Our second gen is autocrossed and open tracked a LOT so the alignment is agressive.
You can't get that much caster using stock upper A arms. We have Global West and Hotchkis upper arms which are great.
Stock geometry is pretty good, we do use 1/2"' taller upper ball joints but actually did not notice an improvement after we installed them, but they are better in theory and probably do help.
If you don't change your upper A arms try this:
set as much positive caster as you can get, probably 2.5 to 3 degrees is all you can get.
set 1 degree negative camber .25 to.5 deg camber is easier on your tires, 1 deg handles a little better.
set toe in at zero, tires straight ahead. If the car does not go straight ahead on the highway, try 1/16" toe in.
Make sure your balljoints, idler arm, tie rod ends, and steering box are all in good shape. Steering box can be adjusted, turn down the Allen screw on top of the box.