yeah I did my own clutch install too. I just wondered b/c from all the suspension components you need to take out on the job, maybe something wasn't put back right. did you use a torque wrench to torque everything tight back to specs? the rack and pinion bolts are in front of and behind the (well I guess you call it the) "rack" and they bolt the rack to the subframe. there are 4 of them which are hard to get to, two in front and two behind. you should remember what a PITA they were if you did the clutch install.
I have eibach sportlines too, but KYB AGX and I only get weird steering when going over bumps. I guess that's called "bump steer" or something like that which has to do with the suspension mods maybe changing the geometry. or maybe it's just the stiffer suspension that makes going over bumps a bad deal. I'm not sure since my auto teacher mentioned lowering causes bad bump steer. on level roads I get good handling and no side to side motion like you mentioned on turns.