To be honest, I hated the air bags. They were a pain in the A%$ to install, even worse to get out. I went to my local spring shop, and added to the front what they called a 3'' lift spring. That seemed to be the ticket. Made a huge difference. I had an 89' and a 95' and the rear seemed to sit higher than the front anyways...
I have never had any experience with tiboron. The coils were so easy to change in my trucks that , I would just get the springs, and change them out. Price was cheap also, I got those 3" lift springs for $60 for the pair. Sorry I can't help more.