From what i get just browsing the growth conditions, they need 30 to 50 percent light, they need to be kept moist, they are terrestrial, so putting them in coconut husk and lava rock is not a great idea. It makes perfect sense why they are not doing well if they are terrestrial and potted like an oncidium.
I think maybe if you read a bit more on exactly what to pot them in, If terrestrial and not "semi-terrestrial" I'd put them in a very light moisture retentive soil (like Ray uses for Spathoglottis) but well draining (yes potting soil) then basically bag them (Put them in a fish tank or wardian case,) away from the windows, where they get some light but not full in the window light.
They are also warm to hot growing so depending on where you live, they may need a heat mat in the winter. They also need lots of moisture.
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