Is there a reason for the DI water? Phal roots don't strike me as the sensitive type (at least the ones I have).
I use tap water and my three phals (two P. amabilis in actual SH - with about 1/4" of a reservoir in a 8 or 9" plastic container - and a P. mannii in a net plastic pot with the hydroton). I water the P. manii daily since it dries out so quick, and the other phals get neglected (maybe once a week they get watered - but the top layer of hydroton gets 'soaked' with a spray bottle almost daily (which also has really dilute fertilizer)) to keep the upper layer of the container more moist.
Since they have sufficient light and warmer temps, maybe water more. For me - I found that too much standing water in S/H is the enemy so I tend to water more and drain the already-small reservoir every time I do.
Also, is your fan blowing directly on the plants?
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