You stated in your first post that you already had the tires balanced so I think you are throwing your money away by paying extra for a 9700 balance. That machine only shines when regular balancers can't detect imperfections in the plies of high speed tires. The faster a tire spins the more it wants to expand in diameter due to centrifugal force. High speed tires have like a band around them that prevents this from happening. If there is a problem in this band, a regular balancer win't pick it up, because it doesn't spin fast enough. The tire will balance fine on the machine, but go out of balance at high speeds. A 9700 will pick this up. One of the balancers I use is a Snap-On that you spin the wheel by hand. The other machine is a big old Sun that I bought about 20 years. Both machines do an excellent job for speeds up to about 100 mph. I don't usually drive faster than that. If you want to talk to someone with a high speed balance problem that even a 9700 can't help with, talk to my neighbor about 20 miles up the road. His name is Craig Breedlove, and he gets his car up to around 600 mph on a straightway.

I still think you need to swap another set of wheels or rotate front to back.

Peter

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