Since you have a fairly new Nismo your shocks are probably not that bad. A front swaybar is a cheap and easy place to start. A front Eibach bar is adjustable and on it's stiffest setting is a little softer than the Hotchkis bar.
What front tire size are you running? I have only run a couple of autoxes but they were tight courses and I found myself wanting more front grip. You could go as wide as 285/35-19 on the front Nismo rims.
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