Hey,
yeah, the mold risk at 55% humidity and the temperature is zero, both are ideal values against mold.
I would turn the buds once a day so they don’t lose their shape. Also, I would trim more sugar leaves and dry them separately on a rolling tray, plastic plate, or plastic box with your hanger or next to it. This also reduces the risk of mold. Additionally, keep the light off as much as possible so the buds are completely in the dark and don’t lose any THC or flavor (terpenes) due to light. Plus, light also increases the temperature and thus the risk of mold.
Have fun smoking!👍