I grow in coastal California so my conditions are different, but I’ve found this type of Oncidium really likes to hang. I take a Vanda basket and put shade cloth on the interior and fill with small grade orchiata. I’ll usually zip tie a bamboo skewer across and cut it to fit to keep the plant from moving until its roots take hold.
Maybe given your warmer conditions you’ll have better luck keeping the roots alive in the peat mix. I’ve tried being super careful with water to no avail. If you see any pseubulb wrinkling, I’d repot immediately.
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