You must have some massive mice! I just weighed our large adult breeders and they average around the 30-32 gram mark. I don't think we have any adults that are over 40g. Our hoppers, which are a step up from fuzzies, weigh between 8-10 grams. I'd double check what you have.

Like I said, she would be capable of eating half her body weigh, I also said I didn't recommend it. 10-15% of body weight, which is usually a meal as big around as the fattest part of her body, is an appropriate meal. So an adult mouse wouldn't be a ridiculously large meal by any means for a 174g ball python.

Rat pups (rats right before/right after their eyes open) should suit your needs for the moment.