I feed Powder a rat pup, 30 - 40 grams once every 8 days and she is an absolute monster for her age

Feed him a rat once every 7 days that weighs about 8 - 14 grams, and get him OFF mice. now. Get him on rats ASAP. trust me... your boa will be happier and healthier on rats and you wont have to switch him off rats for a few years