Electrinic Humidifier

Hello,
I recently bought a 250 count humidor, and I've filled it to capacity. At first I used crystals and regular humidifiers, but I noticed that it wasn't doing the job. There are four shelf’s in the humidor, all filled to max. Recently I purchased an electronic humidifier with fan, and placed it at the bottom pointing up at gaps I left in each shelf. I also took out most of the crystal jars, only leaving two. However, I noticed that the humidity fluctuates, ranging from 59% to 64%. Is that too low? Should I increase the range in the electronic humidifier to 76%?

Attached is a pic, I would appreciate any advice.

Thanks!
Dirk