Having waited for MJ to post ..... I can say that I'm with her on this.  
I have had 2 instances of similar wobble at 70ish. It was noticeable vibration which, in particular, caused the front passenger seat to vibrate back and forth. On one occasion it was caused by non-hubcentric wheel spacers which are really hard to get to sit exactly central so when removed the vibration disappeared. The other was newly - but badly - balanced wheels (in fact, i think one of the weights had come unstuck as there was a sticky patch but with no weight.)
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2002 D2 S8 – Ming Blue, Valcona leather, Vavona wood insert, solar sunroof (to be fitted), Heated rear seats, extended leather pack, 18” Avus, ski hatch, Bose, auto dim rear view mirror, rear blind.
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