The air seat helped, especially on bridges and other straight-across-the-road bumps but they still snap my back some to the tune of causing back pain for 2-3 hours.
Mickey, does your air seat have the release for fore and aft movement? Mine has that feature, in release mode it is spring loaded to center the seat as adjusted but will slide about 3" forward or back to take the jolt out of the back slaming your back.
Also, is your truck a 2wd or 4x4? I would not take any more spring leafs out of your spring pack as you need them for stability when loaded heavy. The air bag over load will become unstable if you use too much air. I would say no more than about 10# empty or they actually ride worse.
Nick