I see what you mean with both posts, the factory rubber body bushings dampen quite a bit. I just got rid of the dampening, car definitely stiffened up.I think the difference can be attributed to the suspension's ability to function properly. A-arms that actually pivot vs merely twisting/flexing rubber bushings might be where the solid/poly body bushings are acceptable vs not. If the suspension pivots as needed vs. 'functional binding', I'm betting the harshness is diminished greatly.