I think Janet_a is right on the money. Overwatering indoors might be your major factor and with no circulation on them, well this scarry movie scenario is spelled out. As for the moss with indoor growing,,,,,,I'd ditch it and just use the bark mix. Here in Indiana the humidity is like a roller coaster. I grow my Phals indoors and I had a couple of Phals in Spagh. One died from rot with the over collection of moisture.
As for the dropping of buds, not much you can really do about that. It just happens when Phals try to adjust to the new enviroment. The bud blasting could be from moving out of the 95 degree temps into the 75 degree house.
Now Connie (PhalPal) is a different story. She is blessed by the orchid gods and never has experienced this. LOL, her experience doesn't count.
I think it's just the grow area and enviroment. Phalpal is able to match it. Perfectly.
As for medium I use Aussie Gold mix with coco husk chips added. This might not work for you as you have far more humid conditions than what I have and this stuff stay moist for longer periods of time. I do have a couple of Phals in a mix of bark, perlite, coco husk chips and charcoal and they seem to love it.