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When you replace the leveling valve, did you adjust the rod? That rod is how you adjust how much air goes into them.
If the rod is good, then look for a check valve on that system for the bags. See if there is a valve coming from any of the valves to the line that goes to the valve. You could have one in the line causing the air to not leak off like it should.
You didn't provide the year, make, model of the truck so I don;t know what type of setup you have. Other things to check would be the air ride on the back of the cab to see if there is an issue there and the shocks. These can also cause the ride to feel rough, especially the cab. If the cab air bags are leaking or have too much air, it can feel even more rough than the bags on the axle since it gives the direct impact to the cab. The air bag on the seat (if inflated) can also so the same thing.
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