From what I know of how they grow, Phaius don't want to dry out ever. The descriptions I see of habitat for this species indicate that it's damp pretty much all the time. It comes from a wide range of elevations, so should thrive in any climate that is frost-free. I don't grow this particular one, do have a hybrid Phaius, and my challenge is keeping it wet enough. Just in general, when it is cold and wet, water less, in winter just water early in the day so things can dry out a bit before the eveinng chill.
Just for the record, for most orchids I ignore the "dry winter rest" advice, my climate is much too dry for that. They bloom anyway, orchids don't read the books or the 'net
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. A few excpetions where "dry" means "dry", but this is not one of them.