Seems like adult mice should be OK? You should weigh your mice, they should be 10% to 15% of the snake weight, so 22 grams to 33 grams. I've had some of my retired breeder mice get as big as 50 grams! I actually like to go back and forth between mice and rats when they are that size.
I only have one snake (out of almost 50 snakes) that is a mouser. She is almost 3000 grams and will ONLY take mice. Last week I gave her a live mouse for the first time instead of pre killed and she ate it. This week I gave her a white rat pup that was almost weaned (live) and she grabbed it and wrapped it (killed it) and decided she didn't want to eat it LOL. All my other snakes will eat either mice or rats no problem at all. The reason I do both is that I run out of rat pups at times and like to feed mice instead. I mainly have my mice for my smaller King snakes, rat pups are too big for those guys.
It's interesting you record all of that data (feeding / shedding / pee /poo / etc.). I used to record all of that but I never used the data for anything other than having it as a curiosity. Now I put a label on each tub with the snake name (morph), the year of birth and the current weight. I only use the weights as a guide for feeding for the rodent size. The only other thing I record is follicle size during breeding. I feed based on body condition so it doesn't really matter if a snake eats or not, if they are fat I'll hold back the food, if they are skinny I'll feed more LOL. The one thing that I really keep track of is my breeding schedule, it's pretty complicated. Some males breed many females and some breed just one or two. Every day I'm moving males around and making sure they are all paired with the right females.
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