This is the thing about oncidium. They tend to hike up as they grow over the years. If you can, mount the whole thing. Or plant them in a larger pot and leave it there for a few years until they walk out of the pot. Then split into smaller sections, then pot them up individually.
You can try planting it slanted so the roots of the new pb are closer to the medium, which is what I did with my Onc. Sweet Sugar Million Dollar. It may look funny at first, but as they grow new pb, it will adjust as long as you don't mind the way it look in the beginning.
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