The suspension is not the issue, it's the tires. I tried almost every pressure setting on the tires, and they offer a constant discomfort. And when going over bumpy roads, I feel the car absorbing these bumps very smoothly, but when going over straight (flat) roads with rough concrete surfaces, I feel every wrinkle, so the tires are the culprit.

Dunlop makes exactly the same tires as I have now (oem ones), but without the runflat 'additions'. They are cheaper too and weigh less !