It is interesting that you're describing the ride as "bumpy" while going at 70 mph on a highway. Did the road have bumps?
I would second the suggestion of checking your tire pressure (you probably want the < 100 mph setting with 4 passengers from the manual). My tires were over-inflated and the ride improved noticeably after I corrected the pressure.
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2018 F87 M2 | LBB | Executive | Moon Roof | Apple CarPlay [2018 F22 M240 (sold) ; 2015 F22 M235i (sold); 2006 E90 330i (sold); 1983 E30 Coupe 320i (sold)]
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