Lowering the humidity in a humidor
I have two humidors, one 20 count for the office and a 50 count for the house. The 20 count has a digital hygrometer, and the 50 count has a built-in analog hygrometer. Both humidors have been staying in the 73% humidity range ever since I purchased and seasoned them. I calibrated both hygrometers last weekend to see if the readings were just high, but they still show 73% humidity. How can I lower the humidity in my humidors? I would like to get it to around 67%. I have tried taking the cigars out, and leaving them open for a day. I also only use propylene glycol to fill my pucks, which I thought would lower the humidity to around 70% at least.
Any advice would be appreciated.