A couple of ideas (and maybe a question or two):
1) When you open your humidor, do you feel resistance from a vacuum seal,or does it open without any resistance? If no resistance, your seal is most likely bad and allowing humidity to escape.
2) How large is your humidor capacity and how many sticks do you have? It is harder to regulate and maintain humidity if you do not have very many sticks in a large humidor.
3) Buy Heartfelt Industries 70% RH beads. These are pretty much revered as the best in the industry. If you go to their site
Heartfelt Industries, Cigar Humidor Humidity Beads, Humidors, and Quality Cigar Accessories, they have a page where you can enter the dimensions of your humidor. From those results, order the amount of RH beads necessary for your size humidor. DO NOT BE EXACT. Order more than you need. They will still regulate and maintain your RH, but the overage will allow your humidor to recover from opening and closing quicker. The extras will also help regulate should you have a poor seal on the humidor.
These are just a couple for you. I hope you can fix the issue. I am not a fan of the shot glasses (except for a temporary fix). Granted, I have three very young kids running around, who always manage to bump the table that my humidor calls home. I am paranoid about splash-over onto my precious humi residents.
Take care!
Jim