Why no follow-up results? IMHO
Just my two cents, but I think a couple of things contribute to the slow follow-up.
First, I think that once the "cide" is initially tested and shows good results, the tester and the company start to assess how to make it better. The process to create a "cide" which is slight different is not as simple as we novices hope. i also think that creating one kind of "cide" then stopping that process and beginning to create another "cide" has been difficult without the manufacturing facility. I think the lab environment is just a slow process when trying to create enough product for the tester to use, particularly given that there are about 8 different ones.
I also think that the toxicity testing takes longer than we would like because the protocols demand the passage of time to assess what happens to the animal over time. Take for example the EKC-cide, it might take care of the EKC but the protocol demands the bunny not go blind 6 months later. But you won't know that for six months. JMHO (I am long and have drank the koolaid, full disclosure.)