My 2 cents:
1) These units are cooled by a Peltier Thermoelectric cooler. In my experience, you will always have some condensate, so if you plug the drain hole, the condensate will run down the back of the unit and puddle on the bottom. A little moisture results even if you don't, so put 1/2 your beads in the rear back bottom, and check it periodically to see if it's saturated. After years of trial and error, I keep my drain hole open, and a clean rag at the bottom rear that seams perpetually moist. No issues.
2) Remember to periodically clean the air intake grill in the back. I have a Whynter cooler, and it has a little screen that comes off for cleaning. I really need to remember to do this on my kitchen refrigerator!
3) Even though I'm a data junkie, keeping too close an eye on humidity will drive you nuts. All those pretty charts are only valid if you remember the error margins that others speak of. Unfortunately, _none_ of the charts I've seen allow for smoothing or include an error margin range. Which leads me to #4...
4) How are your cigars smoking? If they're smoking fine, relax and enjoy! Let that be your ultimate guide. If they're dry, add moisture. If they're moist, leave the door open for an hour or two, or consider dry-boxing the cigars you'll smoke within a week. Above all, relax!