I don't do a lot of s/h, but I know Ray's documented advice is the best time to do it is when a plant is putting out new roots. Paph's do that (mostly) when they are done blooming and they start working on new growths.
I repot paph's when they are in bloom in general, from bark to bark, and don't have problems.
The concern about moving to s/h is that it's a different media, and the new roots help the plant acclimate into 'a new way of life'.
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