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Yea, fill at idle is pretty slow. Mine fills the same way, The pressure reading at the PCU falls off pretty fast to, I am assuming, the protection valve set point. Then you only get whatever volume the compressor is delivering above the protection valve pressure. Big tires... Havnt monitored...

It should be single channel. For the independent operation, have you checked that all three solenoid valves on the PCU are operating properly? While playing with the valve opertion on mine I was able to get the front to deflate by itself/at a higher rate than the rear... well the fan air does...