It sounds to me like he's just not as hungry so quickly with the rats- not sure I'd worry about that, as many captive snakes are over-fed, & they're healthier if slightly under-fed anyway.
Keeping him on mice wouldn't be wrong either, IMO, though the old breeder mice are higher fat content & not as good for him, nutrient-wise. Whatever you want to do- as long as he's eating.
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