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Are the wheels true?
When the wheels were on the balancing machine did anyone test them to see if the actual rim was bent? I once found my wife's car with three bent rims (non Porsche but they were alloys). Spin at low speeds and hold a stick in a constant position relative to the edge of the rim and see if there is any variation. I was amazed there was no crack or other obvious deformity but they were definitely wobbling.
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