If you have Facebook, try messaging Chris Allen (Toms River, NJ), he's an excellent Beardie breeder and friend of mine. And Andy Sollecito (NY, NY), he's a herpetologist and works with zoos and other reptile organizations. Either can probably give you some better insight if you haven't found the answers you're looking for yet.
But from the bits I do know, if his temperatures aren't right and his core temperature isn't warm enough... force feeding food can do more harm as the food just rots in the stomach because they aren't capable of properly digesting it. He could still be coming out of brumation, I never let any of mine actually go into it and kept them active year round so I'm not too sure.