I've kept hundreds of Nephrurus and would politely question some of the above, especially about picking the lizard up and shoving food into its face while holding it.
The hot spot in the low 30s sounds great, especially if you have a large tub (60cm is more than I'd use) with a good gradient. As long as there's ample space at warm temperatures, the cool side shouldn't matter too much. I kept them on a substrate of sand and a single hide at the warm end, but a second or third hide at different parts of the tub won't hurt, especially in something that large.
I'd use a relatively deep amount of sand and keep it slightly moist. Even when keeping desert/arid forms, I always kept the sand moist and had great results. Keep in mind that in the wild it might be scorching hot and bone dry on the surface, but these things burrow down into the sand and can stay nice and humid - remember that they manage to incubate their eggs out in that environment, so lovely places with enough moisture exist there. With a nice large tub like yours you can probably provide a fairly stable moisture gradient as well as a temperature gradient.
I basically only ever used dusted woodies as a feed source, and if he was eating that before, the type of feed probably isn't the issue.
Does he look to be in good condition and has he put on size yet? If not he may just be one of those annoying slow/squeamish starters and you may actually need to assist feed (they do assist feed pretty easily) and if not, it'll either be that he's just settling in or sloughing or something, or there's an issue with the environment. A picture of the enclosure may help - sometimes people have no idea what's wrong and the picture immediately shows it.