My 5 Series feels like it's rocking sideways over highway expansion joints

This is driving me nuts and I can't figure out if I'm being paranoid or if something is actually wrong. I've got a 2017 BMW 530i M Sport with the adaptive suspension, and lately whenever I'm on Sheikh Zayed Road going over those concrete expansion joints, the rear end feels like it kicks sideways slightly, almost like a mini wobble. It doesn't pull left or right, just feels unsettled for a split second. No warning lights, no noises, nothing obvious when I bounce the corners by hand. I've had two different shops look at it and both said "bushings look fine, shocks aren't leaking" but neither of them actually did a proper diagnostic or drove the car themselves. I'm starting to think the adaptive dampers might be getting weak and not responding quickly enough to the road inputs. A friend who tracks his M4 recommended finding a specialist who can plug into the car's computer and actually test the damper response rates, not just visually inspect. I came across a service offering Certified BMW Shock Absorber Replacement By Suspension Repair Dubai, and they claim to bring the factory level diagnostic tools to your home to check the EDC system thoroughly. That level of detail appeals to me because I'm tired of mechanics shrugging and saying "it's probably fine." Has anyone here used a mobile BMW suspension specialist who actually knows how to diagnose adaptive dampers? Also curious if they can do a proper alignment after replacing anything, because I suspect that might be part of the issue too even though the car doesn't pull. Really want to feel confident driving at highway speeds again without overthinking every bump.