Trouble keeping coolidor humid

[44stampede]

Hoping for some tips on my coolidor. I have 1.5 pounds of the 65% beads in it totally filled with distilled water. I still can't manage to get the humidity over 50%. It's a 12 bottle one but I couldn't say how many square inches. It is pretty small.

Is this the danger zone of drying out? It's at a temp of 20 degrees C.

Thanks guys. I would HATE to come back to some of these sticks and find out that the taste is less or changed...