Just a thought, have you had a look at how true the wheels are? I had to replace my rear nearside as it had a ~4mm flat spot. Made the drive pretty awful. Purely a stab in the dark, as your symptoms aren’t the same.
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2010 A8 SE Executive 4.2 FSI D4
2007 Mini Cooper S R56
2008 D3, gone, but not forgotten after 9 years and 90k.
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