First off nix the petemoss! Too many problems with that stuff. If you want a substrate like that, go to cypress mulch that has been rinsed of "dust". Next, We have had very little success with anything smaller than a hopper. Try putting a live one in a small, high sided bowl just below where the snake is hunting and leave it! If using under tank heating, turn it off when feeding.
We have had great success raising our neos on live hoppers and graduating them to pre-killed off tongs and then f/t off tongs. There are always going to be slow starters, which require assist feeding. We feed on a 10 day interval for neos, which doesn't change until they are yearlings. Of coarse, good feeders may graduate to 14 day intervals before then. Once they are large enough, we get them on f/t rat pups and increase from there.
Craig