As long as it's got good muscle tone and a good body shape/proportions I'd say you're doing fine. They have crazy fast metabolisms so seeing that lump disappear in a few days is normal. Some of them just don't push and roam like others. They can take a huge meal but don't necessarily need to. You'll know if it starts pushing, they'll destroy the cage, get a fat lip, scrapes on the jaw, it will be noticeable.
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