If it's any consolation, I am running into the same problem. I thought I'd had it cured...at least temporarily...when I replaced my tires, had an alignment done and (obviously) balancing.
The funny thing is that the problem comes and goes. I had a similar vexing problem with a Honda that I owned and I was able to trace the problem to aftermarket rims that were not hub-centric.
I think the problem is clearly something to do with the rotating bits in the front end. I think it might even be the drive shaft(s). I just had a tie rod replaced on my RHS which mitigated the problem without completely solving it so I think I'm on the right track.
I'll let you know, but I'm not willing to spend lots of money on a soon-to-be 9-year-old car.
Eric
