Aloha Lady T,
You've gotten some good advice on correcting your culture, here's a reminder of the basics that might have helped you avoid the issues you've had to deal with;
Better to underpot than overpot
Better too dry than too wet
Better too loose a media than too dense
Better too much air movement than none
Better too cool than too hot
These are epiphytes that grow in the tops of trees, usually waving about in the daily mist with copious amounts of fresh air, their roots wrapped around bark and exposed to the elements. When Andy is selling his "orchids on a stick" he's showing where they come from. Our attempts to grow them in pots will always require a light hand. The focus of my breeding efforts over the past 20 years is to make them (the Oncidiinae) more "pot friendly", earlier and reliable bloomers, with a floriferous nature. My selection criteria is away from "AOS standards" of flower quality and towards ease of growth expected of houseplants. The fact that some of them are also award quality is gravy!
Anyway, this cross is not as vigorous as the usual Sphacetante hybrid, I used an Odont as the Pod parent so it pulls a bit more to the cool side. I made it more as a stepping stone, though I have not flowered much of the next generation that gives me much hope, I have some other lines with more promise. In and of itself, a beautiful thing.
Good luck,
Jim
Mauna Kea Orchids
Do you have specific vendors who sell your orchids? How would one acquire your beautiful crosses? 
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