I don't have a Sharry Baby, but from what I understand most Oncidium like a lot of water. With bark that coarse I doubt you have to worry about overwatering. If you've only recently potted them in that bark, I would suggest watering at least twice a week, since new bark will hold less water. With ceramic pots it's harder to tell when the bark is dry, but you can test the weight of the pot, it will be much heavier when fully soaked.
As for the light, I have one Oncidium (Howeara Lava Burst) two feet from a south facing window and it does get some direct sun in the early afternoon (supposedly the worst time for orchids to get direct sun, but it has been perfectly happy!), so you may find they don't mind the direct sun. I have another Onc (Twinkle) about 9 feet from the south window, which might not really be enough light. A sheer curtain on that south window if you could get such a thing might be just right, or can you find a little table/plant stand to put a few feet from the south window?
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