The Hudy setup station will let you set camber and toe with a lot of precision. Maybe not needed for club racing, but it's still really nice if you want to spend the money.
I've started balancing my tires and can notice a pretty good difference on high speed sections, the car is much smoother. I'm not sure why more people don't do this as it's cheap once you have a balancer and pretty easy to do.
I don't have a good solution for the spring being loose when running lots of droop. I tend to not run a lot of droop so I don't have the issue, but have seen it on lots of cars, not just the Xray. Maybe someone else has better info.