In regards to your beads chipping, it will happen. What is your method of recharging the beads? Recommended method is to mist them with a spray bottle. If you are pouring water into it, I believe it will cause the beads to crack quicker. Even if you have chipped beads they will still hold humidity so there is nothing to worry about unless you just don't like the mess. I am not sure where you are located but your humidity will fluctuate with the passing seasons. If you live in a colder climate it is to my understanding that rh will drop. Check your seal on the humidor and make sure you seasoned it correctly. Increasing the number of cigars will help. If we are talking a couple % fluctuation then everything is fine and don't worry about it.