Hmm I have not kept White tree frogs, but I do have some Red Eyes and I stayed at a Holiday Inn Express last night so let me toss a few ideas at you and see what you think.
Heating a tank with a heat bulb also has the added benefit of drying the air out in the tank super fast. I would venture a guess and say the hydrometer is way off on it's readings. With a Heat bulb on 24/7 there is almost no way for it to be on average 60% without the substrate being completely soaked with water and swamped out. I am going to link an item below to use in place of the heat bulb.
Ceramic Heat Emitter - If your current dome has a porcelain socket than this will work in your existing dome. He it is a plastic or metal socket you will want to replace the dome. These babies are bit more money than bulbs but last a heck of a lot longer. They will heat the tank 24/7 and produce no light. You will want to either use a thermostat to help control the output temp of find a dome with a dimmer switch on it to help regulate the heat. These things also do not dry out the air so all that precious humidity will stick around for a while.
That is the one thing that jumps out at me right away with your setup is the heating lamp. I tried those, it was a nightmare, and so I switched to the CHE and love them!





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