I agree, by the sounds of it you are feeding too smaller prey. I feed my 07 female adult mice once a week or 2 fat rat pups twice a week. In fact even my new bp which is younger than my female gets one fat rat pup per week.

Mice pinkies are tiny! even fluffs seemed to small in comparison to the size of his head. Make sure you are feeding a large enough prey so your BP doesnt go unsatisfied!