I think the main reason people stop feeding lager prey items after a certain size/age is that it can and does lead to obesity.

Obese snakes do not breed well, so most breeders would take great pains to keep snakes at an even, healthy weight.

There is also the possibility, like the mistake I made, of offering a prey item that is too big, and then have the snake go off feed. {I'm still working with that snake.}

Gale