I'm a newbie so please take that as such and hopefully the more experienced owners that feed multiple mice will chime in here.
We have both our ball pythons on multiple mice (2) per week. These are young adult mice though and not huge retired breeder mice. We offer the first and then when it's been consumed and the snake shows further interest we offer the second. If the snake doesn't show interest we don't push it to take more than it wants that week so some weeks it might be two, some weeks it might be one.
A growing snake is a good thing but better to let it grow naturally I think then push it to get big as fast as possible, it'll get there anyway with time and proper care.
Congrats on having a snake with a great feeding response!
~~Jo~~