Hi Ray
To fertilize my orchids, I use less than a 1/4 tps of RepotMe granular MSU per gallon.
It is hard to keep a temperature at 55F-59F at night when the orchids are indoors but I will definitely leave them past the November month.
i think that the pot is not the issue- i would increase total light gradually.
it is the only area you seem to be not meeting their needs
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All the ways I grow are dictated by the choices I have made and the environment in which I live. Please listen and act accordingly
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Rooted in South Florida....