Congratulations sir, your plant's flowers are beautiful. Are they fragrant?
I bought a flask of these last year and currently have about 20 seedlings. I have some growing in sphagnum (plastic pots), some in lava rock (plastic pots), and some mounted on hickory bark slabs.
The mounted plants have the best looking roots, followed by the ones in lava rock, then the ones in sphagnum.
My observation is that they do not like wet roots. Dry roots are happy roots; lingering moisture seems to stunt them. The mounted seedlings grew meandering roots all winter long, while the potted plants did not.
Mine are all outside right now in 80% humidity, 50% shade, 32°C avg high temp, 22°C avg low.
I fertilize sporadically with 30-10-10 orchid fertilizer mixed with well water high in cal & mag.
In winter, the roots get a daily spraying which dries in minutes. Winter light is direct sun from a southeast window, weather permitting.
There is still a high level of experimentation for me but I can say they are all growing and producing bigger pbulbs, so at least it seems like we are going in the right direction.