I did a quick search... here's a paper about Cstsm denticulatum. It appears to be one of the Ctsm that you never stop completely watering.
Catasetum denticulatum
There's a section from travaldo's blog, and below it a grower from OrchidForum who gets edema on some of the Ctsm he grows (click on the OrchidForum link to see article).
Maybe your Ctsm falls into that category? Just a thought. Maybe these types are more prone to edema because of the different watering? I'm just guessing based on what I read, but it makes sense.
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