Vikki, I did some investigation about the unilugs when I got them, and verified that I had the proper washers (centered). The techs at Cragar told me they had to be finger balanced through the lug holes, because the center hub is not truely centered. Problem is most shops don't have the proper 5 finger balancer for these wheels. As you noted, it is difficult to tighten these wheels up so the run true on the rotor, thus imagine trying to do that on a balancing machine, with a universal lug balace kit.
I'll let you know what I find about the run out on the wheels and tires.