Ooh the hanging toys. Amp absolutely loves them, and we have the same issue, within a day of giving them to her, all the good bits are gone and she'll just ignore the one piece of whatever didn't entice her left on it.
We figured out a way to keep her entertained and chewing without getting bored though; we buy bulk of pumice, vine pieces and cholla, and as we live in the woods and my boyfriend is exceptionally good at identifying trees, we have a steady stream of assorted branches. We bake em and flavor em and sometimes cut em into fun shapes, and keep them all in one big glass baking pan. After a cage clean (every other day, good god the poo and the hay piles up quickly) I take out all the chew toys and pop em back in the dish, then offer her the dish and tell her to pick one. Its exciting for her every time, she'll root around the dish till she sees something she likes, grabs it and runs to her house to chew. Then ill throw in a couple pieces that have already been chewed on a bit, and the rest go back onto her supplies shelf. Every other day, every toy in her cage is new again, and since she picked it herself, shes got at least one that appeals to her. Her tastes seem to change every time, so I'm a fan of knowing whats in there is just what she wants, and she really seems to enjoy going through the toy bin. She also loves chasing the vacuum during a clean. I think the toys and the vacuuming make cleaning time as much fun for her as run time xD