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Some here will feed by weight, some will feed one large meal (1.5x largest width of the snake) and some, like me, will feed mice/rats the same size as the largest width of the snake, or even a little bit smaller, and will feed multiple mice/rats.
So far it sounds like your snake is saying what it wants, so keep with it, trying larger prey as the snake grows, or else be prepared to waste larger prey it won't take.
And as far as I'm concerned, I move my all my snakes to rats as soon as they are able to take rat pinkies/pups...it makes ordering easier not having to order different prey, and the snake will be used to the taste as I move up in size and not have to graduate from the taste of mice to rats. If your snake is eating large mice, I'd try scenting some rat pinkies with mice and then if it takes them, move up to rat fuzzies or weaned rats (same size as a large mouse).