Phals in Sphag -- how tight?

[boytjie]

I switched a couple of my Phals this past spring to a mix which is 75/25 sphagnum and bark. So far, so good -- new growths, and even a keiki. Question, though, for those of you with more experience: how tightly do Phals like to be potted? Should I be packing the sphag mix in there pretty solidly, or just using enough of it to provide moisture and a "structure" for the roots to grab hold of? Seems to me that if it's packed in tightly, it might not dry out quickly enough. Thanks for the input!