HSD's

Hmm an interesting question. Sounds like spring rates if it's how you are explaining. A heavier wheel might dampen it a little. Do you have any preload set on the springs? Too little can make the ride pretty crashy on full extension and too much can lead to bouncing.
I think what you've unlocked here though is a can of worms on the hsd meister debate. I've always found the hsd seems to be a better track / drift suspension out of the box than the old meister zeta 's (their road spec) which is a bit weak for track but beautifully compliant on the road. The only real difference between the 2 is the spring rate as both have very similar levels of adjustments in the same places. This would lend me to suggest you have a look at the preload but if it's set fairly neutral (ie so the spring is just gently squashed a few mm with the wheels off the ground) then I'd say the spring rates are wrong for the weight of the car and the roads you drive on.