Sway Bar ??

[NoHachi]

Maybe I am not understanding you correctly..
My interpretation of your problem is this: you have shocks that you run full stiff to get a sporty feeling car. That is far from ideal, so you wan't a bit more roll resistance from the car itself so you can back off the shocks a notch. That is exactly what the swaybars will give you. Swaybars are springs. They will complement your shocks since you need to dampen swaybars just like all other springs.

That said, the springs jondee mentioned seem like a reasonable gamble. They are in the margin of what you would need to lower 3-4cm's