popeye...you are correct...in the lincolns of old the glass smooth ride in the contenentals was achieved by only using and air spring...the whole car is supported by air bags...the downside is if one goes out the car is sitting on the stops.
Apex, look into taller bags...from looking at the pics, going to a 2" taller bag would make it much happier. Another thing to keep in mind, shop around a bit...95% of the bags out there are firestones and they by far are the best (and its easy to spot a knock off)...as a ballpark I typically pay about $85 per bag, and $250 for a complete kit...I only say this because in apex case these is no sense in spending $250 for a new kit when what needs to be changed is only $160....the mounts and air fittings are universal.
Somewhere I have the firestone reference that gives the bag #, height range, load range and diameter