[Steve-W]

Hmmm this is a difficult one.. my first thought was; did you balance the wheels while still on the car? some shops have a small car-like thingy they ride up against your wheel and then balance it while mounted. sometime balancing components seperatly isn't enough.

If you're suspension is so bad it starts dancing around by itself you must notice it when driving over speedbumps, or offroad-ish conditions. a shot damper will be noticed, clonky sound while going over bumps, body roll etc.

wheel alignment could possible be a factor, but then your car would most likely be pulling into one direction when you let go of the steering wheel. Let alone the tire wear and the 'off' reaction to direction changes. if you do realing, try to go to a place where they do the 4-wheel allignments.

I'll toss this one into my think tank and see if they can come up with a solution.