I have false bottoms in both my MT and BK and my experience has been the same as yours. The BK has the pickup tube in the center, but very little debris gets picked up by it. Most of the trub, hop debris and break material gets caked on top of the FB. It works well with whole hops, pellets or both. I use no other screens or filters between the kettle and the fermenter and I never use a hop bag. Yes, false bottoms rock!