You mention air bags on the back. Why? Was the rear sagging? You wanted to take enough weight off the springs so that they run rough now? Most springs are sort of stiff until you have enough weight on them to make them a bit spoungy.
It reminds me of the 'lumber wagon' description of how the 1 ton trucks used to ride when not loading to some degree.
Now with longer leaf springs, they seem to ride much better.
Try running less air pressure in the air bags, and see if that helps.
I replaced my stock shocks with Bilstiens when the RV was a year old, it was a wonderful improvement. I am not really impressed with Monroe shocks.
Fred.