I'm scratching my head here.
I've had a:
91 4-door
92 4-door
2 95 4-doors
95 2-door
97 4-door Sport
99 GV
And they've all ridden like a dream over bumps - I don't even slow down for them.
AND - I run 23 PSI in the tires, as recommended, at all times (except when wheeling the Gnewt hard, then I go down as low as 8 psi depending on conditions).
I live in the mountains of Colorado, and my Kicks all ride best at 23 psi. Take 'em up to 35, and they get just plain squirrely when cornering hard.