You shouldn't let your humidity drop below 40% - 45%.
Perfect humidity range for drying is: 40% - 55% (45-50 to be completely anal).
Otherwise your bud dries too quickly or too slow and that affects taste, smell and effect.
O this was not for drying bud, this was for cured buds that got bone dry.
My curing took weeks and last stage we just left it out to bone dry.
Well any way, I just put a corn tortilla in a UNIT for a few hours then rotated the contents and it became very fresh.
I let it sit uncovered for an hour then bagged it.