I guess I wasn't sure if you were talking on road or offroad ride. Yeah dropping to 15psi or lower will help. Another thing I feel makes a big differance with ride is shackle angle. I personally like a front end with the shackle up front (that's another debatle all together) with a near 45* shackle angle the /= a shackle, _= a spring here's a crappy picture /__________ but it'll give you an idea. I know my shackles on my yj had a really bad reverse angle when I put a 4" lift on it and it rode pretty poopy. Those same springs with a 45* angle in a lighter rig worked awsome and rode great.
There's a lot to getting a suspension right. Here's the method the desert guys use to drive at crazy speeds: a custom rate spring (get the weight of each corrner of your jeep, call a good spring shop and discuss your needs), a valvable shock, good suspension geometry, and a couple days of "tuning" shock valving. It's not the easiest or cheapest thing in the world to do.
The "poor man's" version of a good suspension is a good set of lift springs (BDS, rubicon express extreme duty, I can't remember who else), poroper shackle angles, and a good set of white shocks factory vavled for your application (a set of shocks designed for a 1 ton chevy isn't going to give you the ride you want, get a set for a yj).