Quite often the orchid has to adjust to a new medium so its a good idea to not make too drastic of a change all at once. It's existing roots will be developed for what it was in before so the best time to move them is just when they start putting out new roots so that the new ones can grow into the new media and support the plant.
S/H means semi/hydroponic. There is a section for that on Orchid Board. People pot their orchids in Leca pellets (other media can be used). The containers have the drainage holes part way up the side so that there are several inches of water and the Leca pellets wick the moisture up to the roots. It's impossible to over water that way. But again, it is best to move them over when new roots have just started. Old roots usually don't like it and die off. I'm sure growers who use S/H can explain better then I can.
You might want to try and find some seaweed (kelp) and use that when watering your plants that have root problems. This will help initiate root growth. It can usually be found at hydroponics stores.
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