There is a local grower here in Western NC who uses something that looks similar to AV mix - it's called Promix. It's all he grows in - paphs and phrags. He manages to have some of the best plants around and always wins awards at our show. My experience with it is that some have done ok if I keep it in Promix, and others stay too wet and therefore go to fine bark mix. I think his GH conditions provide a host of other cultural dimensions (most importantly air movement, probably), that are suited to his mix, whereas in the house, bark seems more predictable as far as maintaining a consistent moisture availability. Good luck!
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