I think you definitely need more beads. I use about 3 lbs of HF 65% in each of mine. I know that is overkill but I never have to worry about RH. Even when I keep the door open for a long time while hunting for a stick it rebounds very quickly. I have about a pound at the bottom, a pound in the middle and another pound spread out in each drawer. I have never used a fan. I try to rotate the inventory regularly. Both of mine stay rock solid at 65 degrees and 62-63%