Sounds like your refusing to feed what it needs to eat?
F/T is fine if they'll eat it, if not then you need to be offering live.

Does the belly heat have a thermostat to regulate it?

The ambient temperature for the warm end shouldn't be that high, shoot for 90-92 for the belly heat and 86-87 for the warm end ambient temperature.

Since it's a tank you might want two hides, one on the hot spot and one in the cool end.