Hi, Alan. I haven't used the mix you mention. I grow mine in CHC chips in air-cone pots. I repot right away so that a) I know what's down there, and b) it's in the right size pot and I know how to water it.
Frowine's book states that phals love to be repotted and should not suffer a setback merely from repotting. He says that stress (loss of leaves) on a newly repotted phal is likely from medium that is too dry.
Fresh medium often is hard to wet, and since reading that, I've started to give newly repotted plants an extra watering a day or so after the repot. This seems to do the trick.
As for damaged foliage-- it doesn't necessarily die. Depends how old the leaf is, I guess.
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