I have just been using distilled water, but I scrounged up some propylene glycol today, so I am going to go with the 55/45 you recommended and see if that helps. The humidor is relatively new, about 3 months....my older humidor didn't have the swing. Plus, since you mentioned it, I was in the one that had the large change getting out a stick to smoke, so that may have contributed. Thanks for the suggestions, I'll let you know how it goes.