I'm with you there...
On my weekly commute through Wisconsin I've been experiencing similarly induced buckling on some relatively newly paved highway (they did it at night throughout the spring - maybe that has something to do with it), and it drove me to set the rear damping a notch lower. But then I got a strange vibration in the front wheel at around 75 and above which seemed to be a direct cause of the damping change, so I put it back, and the vibration went away. My tire pressures were off at that time, but are right now, so I'll try it again.