Hello GB.
I have read that pleated leaves (different than shrivled) on a thin leafed orchid may result from inadequate watering. "If the growing medium dries too much between watering, roots never have a chance to become sufficiently established to boost vigerous growth." (Ortho)
"Some orchids with thin leaves develop “pleating” if there is inadequate moisture during foliage development. This cannot be corrected on the individual leaves once it has occurred; however, adjust the water schedule for future growth."(Missouri Botanical Garden Fact Sheet)
Maybe the plant just needs to re-establish the root system in the new medium. Low humidity and low light can also cause pleated leaves, but it sounds like you have this covered. Joe