Give him tough love, and I would only offer once a week, or even skip a week and offer after 2 weeks. Otherwise to leave him be. I wouldn't worry unless he's lost enough weight that he looks too skinny in appearance.
When offering the rat in front of the hide, definitely just hold it steady there at the opening with the tongs, even if it takes a few minutes. That has the higher chance of getting him to strike at the rat, since your hand naturally provides subtle movements. Don't wiggle it too hard or swing it around, which I see a lot of people do but does not look realistic.
Heat the rat with a blowdryer before offering, particularly the head, and make sure the rat is dry.
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