Ian, you can get the RH up by adding a bunch of plates with wet sponges or wet paper towels.
If you want to season your beads with the hydra, place the beads and hydra in a tupperware container. It works great, I do it all the time.
I use a two gallon rubbermaid from walmart.
The small area won't let the alarm go off on the hydra and it'll stop making you crazy.
Once you've reconditioned the beads and you've alleviated the dryness in the cabinet with sponges, you can put the beads and hydra back in and it should keep up.
If it doesn't, your cabinet is leaking too badly for the stuff to keep up.
If I remember correctly you decided to use half the beads your cabinet calls for because friends of yours have gotten away with it. You may want to calculate your area again and make sure your cabinet has what it requires.
