I've been trying lower humidity with my angraecoids in general. I'm now targeting 70% (as opposed to 90% previously). I grow my plants mounted, and they seem to do just fine (in fact, they relish the drying out cycle) as long as appropriate watering can be kept up.
Of your choices, I would say urschianum is the most challenging. Incredibly delicate and prone to desiccation. I had one imported from Madagascar that took about 15 months to rehabilitate, and yet in three days of an automated watering system failure, it was dead.
With that said, who knows. I've seen people have remarkable success with certain species on windowsills that I struggle with in controlled settings, so who knows! Always exciting to see new people getting into angs!
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