[Dragsinger]

the leaning you describe is a basic characteristic for that suspension style. [basically, you have the car sitting on four coil springs with nothing to control "body roll"]

A rear "anti-roll bar" will cure the leaning and make the car overall more stable. It is very likely that a properly installed and properly adjusted anti-roll bar will allow removing the air bags.

Please correct me if I am mistaken, I think a bolt on kit is legal.