It may not be just how much you are feeding but what you are feeding.
I had a friend who got a hatchling western painted female,
I have a male when my male was 10 years old her female was 2 & was already much larger than mine. The shell was curling on the female. I said to her this turtle is getting too much protein, she said
"I feed her Reptmonin" as if to say to me what else would you expect?
Well I expect variety... mine eats a huge variety of different foods & always has. All my turtles are offered variety & actually very little commercial food.

You might think about trying live crickets, a variety of worms, minnows. I've always fed mine on a rotating basis, never the same meal two feedings in a row.
Try to vary the diet because that should put a stop to this. Once they grow incorrectly they'll never be 100 percent normal but if you catch it early like you are doing it could correct enough that it won't be very noticeable by the time the baby full grown.
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PHRatz

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