The Phal abuse ends here.

[georgeFH]

I have the typical orchid newbie problem. rotting roots from over-watering. After learning the basics on this board, I've replanted my mini-phal in a commercial bark mix, after trimming the dead roots and sprinkled with cinnamon powder. After several weeks, the plants is doing worse, two more leaves have yellowed and dropped off.
When i examined the roots, another one have died off.
The situation now is two semi-healthy roots, two new root bud developing, three leaves left and one tiny new leave developing.
I think the root system I have left may not be enough to support the leaves I have left.
I've repotted again today. This time I used a rooting hormone, Green Light powder, which suppose to contain an anti-fungal compound, and 0.1 hormone. I bought this before reading about the difference between liquid hormone such as KLN and water insoluble powder like what I have. But I think I got around this by dissolving a very small amount of Green Light powder in a couple of drops of rubbing alcohol, diluted with 1 gallon of water.
I soaked the bark mix in this solution, also soaked the plant in the solution for several hours to super-saturate it.
Now I have a clear plastic bag over the plant during the night, but leave it uncovered during the day. My reasoning is that the plant can get light and air flow during the daytime, and higher humidity during night, so the leaves lose moisture slower, and hoping i won't lose anymore leaves before the new root system develop. environment humidity is about 70%. with the bag over it, the humidity is about 90%.
Question is, is it a good idea to fluctuate the humidity like this?