I have been fermenting in a 42 Blichmann and when transferring the beer I plug the 1 micron filter with yeast even though I have dumped most of trub and yeast during the 3 weeks of fermenting. I use 5 lbs pressure from the co2 tank. I did not have this problem when siphoning from a secondary carboy. Does the pressure stir up the yeast? The outlet is well above the settled yeast.