I have kyb/agx shocks with eibach springs and the stock mounts. I currently have a problem with memory steer. (steer to the left hard, car continues to pull left until I steer to the right the same amount) and vice-versa.
caster is the alignment angle that returns the steering to center.......only thing is caster is not adjustable on an RS....unless you have an alk, even then you can barly move it at all...umm in engrish:
first thing is have the alignment checked and your tire pressure and tire tread for wear.