So she seems to be avoiding her OMEM hide. I personally think it's a temperature issue. The OMEM hide sits right next to her dry/warm hide. It's directly on top of the UTH, and directly underneath my CHE. When I temp gun the top of the dry/warm hide, it's 80-84 degrees, but when I temp gun the top and sides of the OMEM hide it's Low 70's.
Last night I even resorted to putting 90+ degree water in the reservoir, but this morning the hide was low 70s again....ground temps are spot on, but I think the ambient temps in the hide are too low. Condensation would actually build on the walls of my old homemade moist hide, and this hide is in the exact same spot. I'm going to try to use less water...also curious to know if you use tap water in the reservoir or some sort of filtered / treated water?
I use tap water in the OMEM's reservoir and for all my geckos' needs.
What are your GROUND temps on the floor of both hides? The under hide ground temps are the key temps.
I heat my leo's 20 long (30 x 12 x 12 inches high) enclosure with a 150 watt All Living Things CHE from PetSmart. The thermostat turns the CHE off at night. I began using this very CHE on 5 March 2015. It's connected to a Hydrofarm Digital Jump Start thermostat with the peak temperature set for 91"F.
I sorta gave up on my temp gun even though it's a good one, because of temp variability. I place 2 probes on the ceramic tile floor of my leo's warm dry hide (thermostat's probe & separate digital thermometer's probe).
My leo's large OMEM hide literally sits right next to her warm dry hide. My leo uses her OMEM hide frequently. Her 150 watt CHE completely covers both hides. My
Oedura castelnaui frequently hugs the outside of his medium OMEM hide, sandwiching himself between that hide and the enclosure's glass.
I do have slate, but I've not added it yet.
EDITED:
I used a small Phillip's screwdriver to make a probe-sized hole in the top of a rectangular upside down baby food container to hold the digital thermometer's probe. That way this probe measures ambient temp inside the OMEM hide.