Thats about what im getting. But i was pulling in a lot of ait and wasnt getting that resistance when i was pulling it...so i took out the dart today and am running it with just foam.
What type of cart filler you are using should have little or no effect on the "draw" (inhale resistance) of the PV.
The exception would be if the filler is allowing so much liquid into the atty that it is becoming over-saturated and "clogged". Then the draw will get harder.