I have read those same horror stories! I don't know about "too wet" underneath the deep litter. I know we don't want it sopping wet, but if you can dry it out to some degree so it's just damp, then start your DL, I think you'll be surprised. I was doing mine wrong. Even though it was easy maintenance and I had no odor problems, and despite the fact that my chickens do very well on it, I wasn't getting a good breakdown of the litter. My problems were easily solved but if a method of keeping odors down and chickens healthy can work even when the method is questionable, then just imagine the benefits when it's all working properly! This is what I have learned:
-- I relied too heavily on pine shavings and not enough on other natural materials, like dry leaves, (complete with small twigs to help with aeration and prevent compaction) maybe a little straw, and whatever else I can find. Most of the microbes we want working our deep litter need oxygen to work well and small twigs and such provide that. I have learned to put in whatever I have on hand. I use grass clippings in the summer when they are available, leaves, garden trimmings and weeds, some straw, and water. Yep, water.
-- My litter was entirely too dry. It was like powder, and boy the dust proved it. After a year, I can still identify pine shavings, even deep in the litter in contact with the ground. Composting in the coop or run needs some moisture to work well. My good friend Beekissed even recommended that I inoculate my litter with a spray bottle and a mixture of ACV and water to jump start it. I just pulled the litter back a bit and very lightly sprayed an area, then pushed the litter back over it. The proportions don't matter that much, because then I gave the entire coop and run a gentle spray down with plain water from the hose. I also now dump the waterers on the litter sometimes when I'm cleaning them. I don't do that often, because it's easy to overdo and saturate a spot, but she was right! The litter around the waterer was in much better condition than what was in the rest of the coop. It is the same way in the run where melting snow and a little rain runs off the sides of it. Those edges all the way around the run are decomposing beautifully. It's the majority of the run and coop that were too dry. As soon as the weather stablilizes, I'm going to pull the litter back and hose down the ground underneath it, then put the same litter back over the dampened soil. I want to encourage the little bugs and worms and such, and I have never seen a worm one under the litter in either the coop or the run. Of course, our soil here is like concrete - another reason to dampen it before the litter goes in. Now I give it a light spray once in awhile if I notice that the dust is getting bad.
-- I was stirring it way too much and way too often. All I really needed to do was use a rake and lightly flip the poop just under the litter. Boy, you'd have thought I was digging for gold the way I dug deep into that litter and turned it over. And that, by the way, added tremendously to the amount of dust in the coop as well.
-- I've been using a poop board under the roosts. Now, that sounded great in theory, and I was one of the greatest advocates for using poop boards. But then, why? If I need the nitrogen from the poop to help in the decomposition process, why was I scooping it out into a bucket and taking it away from where it was needed? Simply raking that accumulated night time poop evenly across the surface of the litter, then lightly flipping some litter over it makes way more sense, and takes way less time than using a scoop and cleaning a poop board. The Sweet PDZ I was using on the board was also absorbent and it contributed to the dust in the air in there as well..
I've just recently started making these changes, and I've already noticed a difference in the deep litter. Right now I have too much straw in it, but in my defense the coop and run aren't heated or insulated so the chickens loved digging holes in the loose, fluffy stuff and snuggling in. I still get an occasional whiff of ammonia if I overwet it, but if it's in the run then I take some litter from the coop and add it, or vice versa. Easy peasy!
I think the most intimidating thing about deep litter is that it takes longer to explain it than it does to just do it. After a few paragraphs my eyes would glaze over and I'd begin wondering about other things, like: flies fly with their legs dangling down and then right in front of you they are suddenly walking on the ceiling.....I didn't see them flip over so their feet were up, did you? Oh, but I digress. Bee did a video of her deep litter and posted it recently. I'll see if I can find it and then edit this novel with the link.
Here's the edit with the link to Beekissed's video.
https://www.backyardchickens.com/t/70/deep-litter-method/1660