I feed my young ones on a 4 day feeding schedule, then when they hit 500-600 grams I move to a 7 day feeding schedule.
You are only just now feeding adult mice? And you started on pinkies? I have yet to see a ball python that couldn't eat hopper mice straight from the egg. Sounds like you should be feeding a little more. Are you feeding a rodent about the same size as the fattest part of the snake?