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I was planning on keeping my run-flats, but just could not live with the punishment when hitting any kind of road imperfection. I have since switched to Michelin Pilot Sport A/S Plus tires and that was an improvement, but still the car sometimes feels like a bowl of jello. It is just so soft. If I drive over a speed bump, it feels like it's gonna bottom out in the rear. I really don't want to screw up the "BMW ride" I paid for, but the car feels a little scary on undulating roads. I call it "porpoising" for want of a better word. It rocks back and forth like a rocking chair. What do I need to do to fix this, without reinventing the entire suspension?
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