unless they are picky none of my ball pythons ever touch mice I feed rats form the time they hatch
a hatchling ball can take a newborn rat with ease and rats in the long run are better at least for you a a adult rat cost alot less than the 4 or 5 mice that one will eat when it is grown also this way I do not have the issues of trying to swich their prey type and have one go off feed
as for growing him quickly put put him on a once every 5 days then to once a week once he starts taking larger prey and he will grow
also is he truly a he ? as males will not get all that big in ball pythons not when compaired to a girl