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Well all the air from the primary and secondary tanks comes thru the wet tank so it is at least reaching the pressure registering on the pri/sec air gauges. The wet tank is smaller than the other two so will bleed off faster than the others... If you are doing any adjustments you really need...

Yep, The protection valve only lets air pass when the wet tank is above around 85PSI. There are two lines coming off of the protection valve, a large one and a small one. The large one feeds CTIS and the small one feeds the cab air suspension. You could start by loosening the small line...