Wow, two fuzzies? That guy looks bigger than my little one and she can easily take two adults, if not two adults and a hopper on top of that. She did today. actually.

Definitely increase prey size, and invest in either a cave hide, or cheap plastic bowls, as Kaorte suggested.

Humidity will vary greatly on what kind of heat you are using as well. Are you using heat bulbs? I used to have a 150 watt infrared, which almost kept it too warm and had my humidity at 40%, max 50% with misting. It bust, and I was stuck with only a 75 watt, which she managed to get by on until I bought a 100 watt. In the meantime, her humidity sky-rocketed to 70%, and after misting, a whopping 85%.