I agree, theres a thread somewhere about curing with a hygrometer. I read it and went out and bought some. My dry room is about 25%RH, so I dry them for about 3 days until theyre crispy on the edges. Then I put them in the jars with a Caliber III hygrometer in each jar. If the RH ends up higher then 60% I burp the jar accordingly. Once the RH is at 59% and holding (or lower, but hopefully not much lower) I keep the jar sealed until use. The longer it stays sealed the better, and it will continue to cure like this.
put 2 or 3 cups of water in your dry room I'm doing this for veg, my humidity is low too.