OK, fast thoughts.
According to my personal research... DE works through two processes... first simple wicking of moisture away from the body, and secondly by scratching, cutting, and puncturing the exoskelleton to allow seepage of fluids... I could see it having an effect upon the wormies. And it MUST be true because I saw it on the internet!
GOOGLE
Seriously though... save EVERYTHING which you would otherwise dispose of including the frass once beetles have been in contact with it. Keep it in a separate bin for several weeks with a fresh moisture source. Just remember that they lay their eggs in the frass, along the bottom of the bins. That is what the little bumps on the bottom of the bins are.
Sift beetle bins weekly, place what passed through the screens into its own bin, bran and all. It will take a 12 week cycle max.
If you have bran 1 1/2" deep and can see the surface of the bran, you have room for more beetles. Give them cardboard to climb on. This prevents wasted bran and time. Less than 50 beetles could live in space the size of a softball in diameter... comfortably... in fact they prefer to be in close quarters. The male selects his female and then remains by her side guarding her from other males. He will not leave her side easily.
If you have veggies left tomorrow, you put too much in today. If they are drying out within hours due to heat and wind, then swap with fresh and reconstitute the dried out pieces in fresh water just like rehydrating dehydrated foods for yourself.
As some of you have learned, there are serious reasons I keep beating the drum of wheat bran only as feed and bedding.
If you have parasites, feed everything to your chicks and start over. It is not worth the hassle of trying to recover the colony... what are you going to do... spray the colony for bugs?
OK, that's all from me for a while.
Have fun!