Would love to see a photo of your sprouting setup.

Not sure I could get my wife to go for such a setup in our kitchen, but perhaps I might be able to do such as system outside in the summer. Interesting to hear that it seems your barley is lasting longer than when fermenting. BTW, some BOSS have been treated (I forget how but I think it's some sort of chemical preservative) to inhibit sprouting. When I did sprout them, they had 1.5-2" long sprouts after 3-4 days but that was in the warm (80s) of summer. I'm not a sprouting expert but 8 days does seem like a long time to sprout anything and it gives it more of a chance to grow mold. Yogurt is actually not such a good starter, though, because it needs about 105-110F to really do its thing. Kefir, clabbered milk, kraut juice and water kefir all work very well at room temperature.
The EM method requires a fairly anaerobic environment. I keep a piece of plastic on top of the food and a bucket lid tight on that. No flies! I keep it inside in the basement furnace room, scoop out the daily ration into a smaller bucket and take it out to the chickens. It doesn't smell either, except slightly sweet-sour. It's only about 50% moisture, so there is no straining. No stirring either except when I first mix the batch up. It just sits there until I'm ready to use it. Takes me about 15 minutes to make a batch every 10 days or so.
My hunch though is that there are benefits to both sprouting and fermenting and the ideal situation would be to do both. But I'm lazy and that just sounds like too much work to do both all the time! Our birds are already getting some pretty excellent nutrition. Oh yeah, I also just started a mealworm farm, which is fascinating!