Good job.
I have a fair amount of experience with fodder. I actually taught classes on the topic open to our 500 member chicken group conducted in a classroom at the humane society here.
I agree that barley is the best seed for the practice. I also had trays of wheat, oats, buckwheat and sunflower seeds. The latter worked quite well also. The results with oats were a bit of a disappointment. Experimenting with several techniques, I found that the initial soak of 8 hours worked better than 24. The idea is that the longer soak causes the seed to swell enough to slightly hinder onset of germination. However, an 8 hour soak requires more frequent rinsing in the first couple days.
Your results look very similar to mine.
I have another comment.
While I don't see a reference to it on the ingredient label, seed meant for planting usually contains antifungals and sometimes insecticides. Neither of which is suitable for food. I always specify that I would only accept feed barley (and other seed).
I once called my local feed store and was pleasantly surprised to find they had an 80 lb. sack of barley which they don't usually carry. I specifically asked if it was feed grade and not seed grade. They said it was. When I got there I asked why they had it and they told me someone ordered it for brewing beer. But then he changed his mind and didn't want to buy it. They loaded it in my truck and I drove home. Before I took it out of the truck, I read the label and found it contained fungicide and insecticide. I was sure that was why the brewer refused it. I promptly returned it. They pulled several other nefarious things (mostly expired product) and even though it is less than 10 minutes from the house and the next feed stores are a half hour away in the next state, I never shopped there again.