Okay, I did some more work on the old girl.
I temporarily installed the Avallo after Ron got me the new parts. He even sent a better control module with an extra circulation fan, so I put it to use. It got everything right up to perfect overnight and has been holding rock solid ever since.
I have a few pics of what I did...
Here's a pic of the Avallo water resevoir all ready to stuff in the bottom of the humi.
Here's a shot of the new beads I'd mentioned. I just filled the bottom of the humi all around the crumb catcher in the base. I failed to weigh how much I added, but it only took about half what I had planned on using. I think there's about seven pounds in there.
The beads did an excellent job all on their own, but with all the leaky glass and low temp/humidity in the basement, the Avallo will keep them recharged really well. It doesn't hardly run at all and I can't tell a difference in the water in the resevoir, so I expect it'll run for months on one refill, and it doesn't hold very much water at all.
I kind of plan to change the water every month. Wish me luck with that.
Here's a lousy shot of the Avallo controller. The top left is my setting, top right is actual RH%age, and bottom right is the temperature inside the unt. This is where I was right when I set it in there and after I'd opened the doors 100 times. The beads and fans recovered as fast as I could screw things up.