Keeping inside of a cache pot without drainage holes can effect the normal drying rate of the media. Oncidiums like to be watered maybe every three days, then dry quickly, then watered again! That cache pot throws the wet dry cycle out of whack!!
Media seems a bit too coarse. Seedling bark/charcoal/perlite is best. As small of a pot as possible.
Minor shriveling of the big pseudobulb tells you that it is not getting quite enough water.
How about light? 1-2 hours of morning sun is a good idea.
Oncidiums do not hold on to those smaller side leaves or leafy bracts for very long. New pseudobulbs typically hold leaves 12-18 months. That is normal. They never get to become large leafy/lush plants. They just don't do that.
They have very fine, water loving roots, that dry out quickly. They hate to sit damp or too wet.
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