kcid, maybe you and I need to work together, because I'm a terrible 3d modeler, but I do know a fair amount about car setup and physics. Interested in some ideas far cars I'd like to see?
I checked in one change though: I adjusted the camber/caster values. I'm not sure exactly why, but giving it those values stops it from wobbling slowly left to right at high speeds when disturbed.
I'll explain the physics of why that stabilizes it to you later. I'd probly crash the db if I put all in one post here - I hadn't gotten that far, but there are two or three cars that do that, and even more that need minor tweaks to get them to within the realm of realism.