I've actually havent tried anything else other than crickets. I just let two or three of them , dusted and gut loaded, run around the enclouser until they're eaten, and its fun to watch them gobble them up. Also let them eat as much as they can in one sitting, every two-three days. And if you want to handle them after when they eat, let them rest a day before you do so. Also if yours is an WC adult, and you caught it yourself, then gather some branches and leaves around that area so it would feel more like the area it would be living in, rather than plastic plants, in my mind I think they like that better.
Anyways I would feed them nothing but crickets (get the kind that dont chirp so you wont be annoyed 24/7). They're more nutritious and they eat them in the wild anyways.