I think you're fine. When they are young, they eat and grow. I feed my little guys every 5 days (mice.) I feed my adults Once a week (small rats.) I feed my big females once every 2 weeks (medium rats.) Your guy sounds like a good eater which is great. I say just keep on keeping on and don't worry too much at this stage. He's young and growing. My 280 gram female fire eats 2 jumbo mice every week. She is an eater and growing just fine.
You'll notice a good "fattening" and growth when you switch from mice to rats. Typically this happens around 450 grams or so.
Keep in mind that as they get older and into adulthood, they will go off feed during the breeding season, so keeping them at a good weight throughout the rest of the year is optimal.
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