Originally Posted by B&W_Evader

Couple more things to check on each tire...

Wheel Bearings: lift it off the ground and Push/Pull Top and Bottom (12 & 6 o-clock). Do it with gusto! There should be very little to no play. Less than 1/64 inch at the rim I would think is fine.

Control arms: Have someone else Push/Pull 3 & 9 o-clock. Watch the control arms. If you see the ends shift in their seats, replace them.

Shocks maybe?
How do your shocks feel? Does the car settle immediately after a large bump or does it take a 2 or 3 cycles to settle.

Also, I would expect a little instability over cobblestone type roads since we have fairly stiff suspensions. If you want better stability over that kind of surface go with the dual rate springs like swift.