Maybe the dry environment you have is the reason I'm scratching my head after reading this thread. While I'm still relatively new to this addiction, my goal has always been to get my Vandas as wet as possible once a day, then get them to dry out quickly. This being accomplished by a 6AM irrigation, then drying from the dropping humidity as the day progresses and natural breezes. Vanda roots that stay damp too long quickly develop rots or fungus. The vase and bottom of the Vanda just looks too damp to me. Even in a low humidity region, I would think the Vanda would respond better to being dried off top and bottom with a gentle fan at least a few hours every day.