Josh, your females sound like they are doing fine. They are definitely big enough to produce some nice clutches for you. If you are worried that they are getting a little "too chunky" you can cut back the frequency of feedings. For their size, I personally wouldn't offer them smaller meals.
As far as the snake that isn't eating for you... can you give us a little more information as far as what you've tried already? I usually don't offer mice, gerbils, ASFs or any other type of prey until I've exhausted every other choice I have with rats.
There are a thousand different variables that can lead a snake to eat or not and probably just as many different tips, tricks and methods that you can employ to get them to eat. (You've been here for years now, so I know you know this.) Just let us know what you've tried so far and what you ultimately want your snake to eat. A little history about him also can't hurt... essentially - is he/she a new acquisition? Age/size? New tub/rack/tank? Any changes in cage furniture or environment? New bedding? Different rodent breeder? Was he/she eating before? If so, what was he eating? Why do you think he stopped eating?
You obviously don't need to type up answers to ALL of these questions, but they are the general questions I ask myself when I have a snake that won't eat. A little history will help us give you some ideas as to not only what to try but it can possibly help to figure out WHY it won't eat (which is actually the more important issue).
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Stay United!

I'm still not sure if it's weird that my best friend is a two year old boa named Ronin. He's quiet, non-judgemental and listens... what more could you want?