Your welcome...I am no expert but what is an expert anyway right?
My cousin has a sheep farm and 3 years + we have been working with worms and sheep compost now using it in bins. Idea comes to mind here and I am trying it now matter a fact. I cut a 4 inch "thin wall" PVC about 16 inches long then cut out some holes into the side (you can use a band saw) so worms and get in and out of it.
What I am trying is this. I have a 2 foot deep worm bin and each PVC that is standing up in it get's a different food source. So then I can check them at times to see which ones are getting the most attention. They are all located in a large bin about 7 feet long and 3 feet wide and about 2 feet deep.
So far I see the wigglers LOVE corn meal and the red worms (we call em "drill heads"

like about anything so they are super bin worms because we find them at bottom,sides and the surface area.
My message is that IF your bin is not giving the worms what they want OR it is too toxic or whatever then they might go into one of these PVC chambers as option to "escape" whatever it is they are trying to get away from. You mention they were going down and that is what I am trying to get at. If the worm has an option it WILL take it. We see this on the farm they will change their habits almost over night at times. One day they are here and at this level then next day you move to a "toxic wet manure" area and there are thousands of them. Even the weather changes how they act.
Cousins bin and mine are 14 miles apart and yet if I see little ones on the floor for no good reason I call my cousin and guess what? He says "yep same thing here" but then when they stop running away his also stop. So we know it is the "barometer" that causes this because it always happened before or during a rain or seasonal change.
Maybe we are nuts I don't know. But we have been really watching these 2 worm cultures very close.
Just some FYI for anyone interested
