Cool project.
Had bit if a scare, I was using cheap walmart hygrometers, and seeing my weed shoot up to 70%, I bagged them and strung the bags above a dehumidifier.
I picked up a 20$ digital hygrometer from my local shop and was horrified to see my pot at 55% so I quickly jarred them up again. Thankfully it eventually creeped up to 62%, so I am back in the cure zone. With luck it will creep up another 1 or 2.