[Charles]

You might try wetting the roots three or four times a day indstead of constant contact with the moss.
Vandas are what I do best. I have brought many seedlings back from the brink after a torturous drying and shipping procedure carried out by an E-bay seller. Try the bag-n-sphag trick for the really needy ones.
I wet my others often during the warmer months here in Fl. With the garden hose. Water directly from the well. Two, three even four times a day in the mid summer. But let them dry between wetting. And do not wet the leaves late in the day. They really want to be dry before it cools down for the night. Lots of light. Slowly introduce them to brightest light. They will burn if too much is given too fast. It can take two or more weeks to introduce them to high sun light conditions. Don't be fooled either. Sunburn can take a week or more to visibly show on the plant.
Be patient.