Considering what I read about your temps in there already, I’d use a CHE. Set it up on its own separate thermostat from your UTH and not directly above it, and set your thermostats so that your surface temps are at the target temperatures using a temp gun in the enclosure, not just on the thermostat, which should be at around 88-90° F in the hot zone/basking, and about 75-80° F on the cool side.
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