Aquamist HFS-3 and MINI Tank GB

[BostonR56S]

Jeff-

When this used to only happen intermittently, now is happening everytime the meth activates...

After letting off from a hard accel where pump is activated and flow gauge shows flow... there is always one bar that remains lit... for about 5-6 seconds.

Is this just a sensitivity setting on the gauge, or is it actually still minimally spraying while I'm in vacuum/off throttle?
I have that 1bar check valve in there right before the nozzle that we tried a while back, so not sure if thats playing anything with it.