The cool side may be reading wrong because you are using an analog thermometer. It could explain a lot. The temperatures seem fine. Try to get the hot spot a little higher to about 88F. Humidity is a little low. It should be about 60% and raised to 70% when in shed. many people say a male can live in a 20 gal for his entire life but a friend of mine has a 1500g male. Not all of them are small, so be prepared to have the possibility of an update in size.