Well, it didn't matter what I tried... backing off on watering, varying the degree of sunlight and humidity...
It just wouldn't grow and gradually shed its leaves. Once it was down to the last leaf, and the very tiny pseudobulb started showing signs of shriveling, I knew it was over.
I just don't understand what truly went wrong. It looked to be healthy for a good 8 months, but the mid winter seemed to have killed it. I guess the ambient temperature just needed to be higher.