I measure the heat of the prey with a heat gun
I try and keep them in the 90s or mid 80s. If they go below 80 I take them and warm them up with a hair dryer.
I would heat it up a little warmer into the high 90s or low 100s. You are also right about some snakes preferring rats over mice. I had one hatchling this year refuse 8 mouse hoppers before finally taking a rat fuzzy
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"I'd rather be hated for who I am, than loved for who I am not" -Kurt Cobain