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I have felt this too OP. Windy day, strong gusts hitting the rear quarter make the back end of the car feel uncomfortably light at 100 mph. (Deserted highway, I had just been passed by an Audi A4 and sped up from limit just to see how fast he was cruising.) After a few seconds of "Whoa, this is new!" I dropped back to 60 and the car went stable again. Alignment is good, tires were almost new, pressures good. I do have the stock rear spoiler.
I think it is more to do with the shape of our cars. Not saying they produce gobbs of down force or anything but I remember a video on the development of the car where the Japanese engineers were talking about the shape and how every crease has a purpose aerodynamically. Even the little canards on the tail lights are there to do something.
A strong, gusty wind on the rear quarter definitely does lighten the tail end and push the car around a little at those kind of speeds, IMO. If I hadn't experienced it, I would have been skeptical.
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