Thank you for the story. I actually ended up here because I ended up with a ball python and was trying to figure out how much underweight he was/is (and he's my first snake to boot) and find pictures to gauge if how much I was feeding him was helping him gain weight healthily.
He was at 60g a week after I bought him (didn't think to weigh him when I first got him). It took me another week to figure out what he'll take, so far I've had 3 consistent feedings with him and been doing it once every few days.