You're not anywhere near popping a bead at 25 psi. I'd say from my own experience that you should be able to go down to 12 psi without losing a bead.
As for the Level-O-Gauges....NEVER, and I mean NEVER let them determine whether or not you are going to roll.
Something as simple as one passenger in a different seat will compromise the accuracy of such gimmicky devices. They're merely a golly-gee-wiz accessory and will tell you nothing about how close you really are to rolling.
Just a warning.
Sean
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