Have you tried rats yet? I would switch if you can makes life a lot easier I feed mine once a week small rat as adults seems to work great for my big normal girl she is about 1350G right now. Also here is a feeder chart from a local rodent supplier in the Seattle Area
Edit do you have a scale for snake weight yet that also help take a lot of the guess work out of what size to feed
MICE
Sm. Pink 1-2 grams
Lg. Pink 2-4 grams
Peach Fuzz 4-6 grams
Fuzzies 5-8 grams
Hoppers 8-12 grams
Sm. Mice 11-16 grams
Med. Mice 15-24 grams
Lg. Mice 24-28 grams
XLg. Mice 30 grams+
Rats:
Rat Sm. Pink 3-8 grams
Rat Lg. Pink 5-12 grams
Rat Fuzzies 10-20 grams
Rat Pup 20-30 grams
Rat Wean 30-45 grams
Rat Sm. 40-80 grams
Rat Med. 80-150 grams
Rat Lg. 140-200 grams
Rat XLg. 190-250 grams