Hi, thelink.. I saw your post in GCS too.. I think you're overpotting your paph, whatever it may be. Brachys usually like being underpotted. Overpotting may result in root rot..
I have my doubts about this plant being straight niveum or even thaianum. If this is not a stressed out blooming then the pouch is completely wrong for a niveum. It should be "egg" shaped for niveum where this one is more like a concolor shaped pouch. I would be interested in knowing more of the history of this plant. It could be a new species or natural hybrid. How did you come by this plant? What about the source that you got it from, can ask them about it's origin?