Darn petstores that's very incorrect info, your humidity isn't to bad but you want it to stay in between 70-80%. I keep mine around 75%, and you also don't want big fluctuations or he may not like it. Your heat is way to cold, try and get it up to the 80's. 82f is perfect, he may not be burrowing because its not warm enough to make him want to cool off. and let it drop a few degrees at night, lets say around 78f.