fuzzy mice? how much does the snake weigh?
you need to leave the snake alone for a while until it's more consistant with feeding. you have 20+ years to bond, so a week or two won't affect the snake for the long-term.
"cage aggression" is a myth. the snake will not associate you entering the enclosure with getting fed. i promise. keep feeding inside the enclosure.
this could also be a husbandry issue. what is your setup like? heating element(s), enclosure type and size, thermostats and thermometers, exact temperatures and humidity, etc.
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