I had similar problems with sphagnum when used to help mount to treefern or mixed with bark in a vanda basket (temp 70-85f, humidity @ that time fluctuated 60-80%, 1-3x/day spraying). All did well initially, but within a few weeks they took a turn, and I discovered root rot.
All plants were re-mounted, using just wire or monofilament, and have put out plenty of new roots and pseudobulbs.
If you don't have enough humidity, light, temp, water, air- mounts will not do well, and trying to sustain them will be a hassle.
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