I would try a live hopper if you can find one. I know you may not want to feed live, but the wiggley little hoppers can really trigger that feeding response. I would not continue trying nightly, as this is probably freaking him out a bit. Give him 4-5 days of being left alone completely (aside from filling his water dish / cleaning up any poops) and give the live a shot. Once he's comfortable and eating for you, then you can start working on switching to f/t again.
It's hard to say if hoppers are the right side, honestly, probably not. Usually hatchlings right out of the egg can take a hopper mouse. But, if he's still a little guy, the hopper might be better to get him eating. I know you don't have a scale, but you really should grab one from walmart / target if you want a more definitive answer on what size he should be eating. They are only around $15-20 (kitchen section, food scale that does grams) and it will help determine if he's losing a lot of weight or not, and what size prey he should be on.
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