I had thought about bags for comfort as well. When were hooked up the factory overloads are just in contact with the rubber pads on the overload perches. My thought was to remove the overloads and install bags w/ping tanks on each side, keeping the bags separate, it seems that connecting the sides will allow the air to move side to side and probably allow the truck to lean more in the turns. The ping tanks are supposed to increase the volume the air bag have to compress making them more progressive, as long as the air lines between the tanks and bags are large enough too not hurt the airflow.
I believe my ride issue is the rear suspension extends after the bump, raising off the overloads, and then hitting the overloads upon compressing the suspension back to normal loaded ride height. It feels like a delayed hit to the rear tires.