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I had the same vibration issue with my 2011 520d with EDC suspension. The problem was my wheels/tires. I now have 20" BBS CH-R with Michelin PSS and i have no more vibrations.
The car came with 18" msport wheels and continental runflat tires. The vibration was felt in the seatbacks at around 110-120 km/h.
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BMW G05 X5 Xdrive45e M-sport - Air Suspension - Sport automatic - 741M 21" wheels | 275/40-R21 | 315/35-R21 | Nokian Hakkapelliita 9 | Sapphire Black | B&W Diamond Surround Sound | Comfort Seats | Merino Leather | Extended Shadow Line |