Questions all over the place!

[dijit]

I dont see a problem with the two hygrometers other than the reading discrepancy. I would salt test the new one to make sure it is calibrated correctly. Depending on the size of the new humidor you may or may not have enough beads and or need a circulation fan. You also may want to check the seals around the glass to make sure you arent bleeding all your humidity out to the rest of the room.