Nick,
I think you are being a bit of a mamby pamby, she is on steel suspension has wopping great tyres and the roads in Surrey are shite...mine bounces like a yoyo without any load on the back, and once you start bouncing your foot bounces on the accelerator and you get even more bounce as you open and close the throttle unintentionally...
when driving on A roads try to keep your foot steady, not easy, and no matter how small a bump she will bounce over it and that goes through all the body. when loaded the springs are working a bit better and the bounce is much less noticeable..just to be sure she is nice and smooth on the motorway for instance, foot flat max speed 45-46 mph...