A thought about production line tolerances: perhaps it has as much to do with the plant that assembled the unibody? Maybe some had jigs that allowed more performance oriented alignments?

And my thoughts on alignment specs here: for street driving, caster is far more important than camber. The reality is that youre more likely to notice the self centering afforded by caster than the extra grip from the camber. Racing is a different story, especially autocross.

To those that have a hard time achieving caster, is the rear ride height boosted over stock? Changing the angle of the car will affect caster, a lower rear ride height will improve caster.

Has anyone ever done away with the cams and lengthened the slots to allow more adjustment? The cams are strictly to ease adjustment, once the bolts are torqued they dont do squat.