When they want to eat, let them eat.
My personal experience: My Enchi female (that I got as a hatchling) grew incredibly quickly. All I did was feed her appropriately sized meals every 4 days until she was big enough for small rats, then fed her small rats weekly until she was big enough for mediums (weekly with those as well). During that time, she didn't refuse a single meal, and was up to 2000 grams by the time she was 14 months old. She's slowed off considerably since then (she won't be 2 years until January), so I've backed her down to small rats weekly when she wants to eat. While she was growing, though, I didn't hesitate to let her "pack on the pounds" as she saw fit.
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