Went thru the same thing. Our ride roads are a mess and the ride was so rough and a bit hard to control.
We did the following. Went down and got a real weight on front and rear. Changed tire pressures to fit weight. Many tire companys list proper tire pressure for weight load on tire. Go by those not what the builder or tire says. Our front end was light so now fill water tank that is forward. Empty holding tanks at are in rear. Reloaded rig so more weight forward. Got another real weight on each tire then changed tire pressures again. Then went to Monroe shocks. Rides great. But no one thing did the trick. Took all of them. It now handles very well.