Daigga-- I had some problem chewers, they were driving me crazy! Idk how large scale you breed and this may not be feasible for you (I only have 20 breeders), but throwing in some uncooked pasta with their food a couple times a week has gotten rid of my chewing problems. I just buy the biggest bag of whatever is the cheapest enriched pasta (usually store brand egg noodles) at the grocery store. They seem satisfied to chew on that and not the bottles, tubs, etc.
Chewing issues can be addressed very easily, a 2x4 piece of wood will do the trick.
Something else must be done with chewers, every chewers and cagemates MUST be euthanised, if they chew once they will chew again and also teach other to do so.