I was thinking about this one again tonight. While it is normal for wax moths to get into even strong hives, it’s probably not normal for the wax moths to grow to any significant size before being chased off by the bees. Hence I think you should pull some frames and make sure the wax moths aren’t chewing up your comb.
I do see larger larvae under my strong hives, but that is because of the unique design of my insulated hive. Finding larger wax moth larvae in a conventional setup would warrant some concern. My hives are insulated on all 6 sides. There is insulated UNDER me screened bottom. This means wax and debris and small wax moth larvae collect under the screen yet on top of my bottom insulated. This provides a place for the wax moths to eat and grow without being molested by the bees. It would be a better design to simply let the wax, debris and moths fall into the grass (like conventional hives), but that complicates my insulation designs. So anyhow, in my design the small wax moths do have a place to grow and hence I do find larger larvae under my hives. I have a cleanout door to clean them out when I get around to it.
Bottom line, in a conventional setup, if you’re finding larger worms, you need to check your combs to be sure you don’t have an infestation that is out of control.