Mike, the mix is small bark by Schultz. I used a few larger chips from my other mix just on top. Confession time: After that incredibly, in-depth tutorial you gave, I tried your recipe on 2 of my Phals and they both died. I didn't want to tell you...I didn't want to make you feel bad.
I don't know why it works so well for you and didn't, for me? I can only assume the weather here being so humid, caused this mix to retain too much moisture, possibly? Watering the plants, created a very soggy, muddy mixture that seemed, never to dry and both plants were dead within 2 weeks.
I'm finding that the Schultz works best on my Phals and I've had pretty good results so far. This one Phal. is also stiff, it's just the newest leaf that's all of a sudden gotten droopy. I'm assuming it's because of the type of Phal it is, from what others here have advised. I didn't unpot the plant but looking through the pot, the roots appear to be healthy. I don't think I'm over or under watering. The bark is maintaining moisture and does dry out so I'm hoping that this one leaf will just straighten out as others here have seen this with their Phals.
Fingers crossed....