I'd stay with mice on future attempts until he is eating well for you; most carpet breeders start their hatchlings on mice anyway. If he shows no interest in the F/T I'd give him some good perch options and wait til he's on one for the next offering. He might need more movement but you'll want him to be able to stalk his prey without getting bumped in the nose every few seconds in case he's stressed and defensive. Wouldn't hurt to add some fake foliage to those perches, give him a bit more security.