alignment #s

What is your toe-in setting? That setting has a lot more to do with straight line road feel than either caster or camber. Your +3 caster should make the car more resistant to steering inputs than the stock #'s. And i assume you have -.5º (-1/2), not -5º camber right?

As far as not returning to neutral, that's a function of the steering box. I'm guessing that the Stage 2 box doesn't have enough "boost" at >10mph to overcome the friction of your front tires. Also, what size tires do you have up front? Wider tires tend to be twitchier on the street, and can "seek out" grooves and tracks in the road more than narrower tires. Some of that depends on the tread design, some brands/models do it more or less than others, but on the whole wider tires are more likely to do it. That said, I run 275 wide front tires on my Duster and Challenger. They do a little more tracking than smaller tires, but its not hard to deal with.