I'm glad to hear that this is what worked for you! I just moved mine in front of a South facing window that only gets 2-3 hours direct sunlight a day. I'll have to find some dyna grow to try and further encourage new growth.
My larger phal was sending up a spike, but then I went on vacation and my 'chids were at the mercy of my husband.
Needless to say the spike stunted (probably from not enough water I think), and is still a little bitty nubbin at the base of the plant. But at least the root that was forming below it appears to be doing well!