Xikar Crystal Humidifier Jar 4 oz.

I have a 75-100 Cigar humidor and with this product it will not maintain anything above 62% humidity. Am I doing something wrong? I'm using the Xikar Humidifier Solution "Maintains 70% RH" and it appears to be "full". The Humidor is air tight and has a good seal.

I have 4 , 72% bovedas in a 120 count humidor and my rh is 64%. i hoping this might work as a little boost to get it up to 70%? any thoughts?

I have a small humidor with one of these in it and it will not keep humidity above 60% by itself does anyone have this issue ?

Distilled Water, purest form, works with these crystals?