When mine get too small for a hide, I just go with the next size larger and let them grow into it. With established eaters, it's never been an issue.

I do use a tub and rack system, so for me it's like putting a hide inside a hide, so if you're using a tank, you might have different results.

If you try a larger hide and your snake stops eating, you can always go back to the smaller one and save the larger hide for later.