Are you guessing your running 15 psi? The bags I have are off a semi trailer that's why I run such little air. All the double bellow bags are Probably only 5000lbs bags. Does each bag have its own air line or did you tee them.
I ran two valves to each bag, one for fill and one for dump.
There isn’t a T. I added the cutoff valve to try and mitigate my loss of air while parked.
I have Shrader valves on each bag to check pressure. It’s possible I’m recalling incorrectly.
I have the analog gauges for the individual bags, just hadn’t hooked em up. Each bad has 1/2” valve and 3/8 lines.
It only takes a quick blip of the switch to get to ride height. I’ll go out and double check the PSI
Edit to add.
I originally did T them without check valves. That’s a terrible idea. I felt like the air shifted from bag to bag while driving and caused a ton of roll.