Enjoying watching ya work on this! Have you found the organic liquids to go anaero and spoil much in the kratky? I know if I mix up some food from my GO box and don't use it all within a day, it goes mad stinky and I must presume it went anaerobic and spoiled. I think I saw some hydro guys say the same when they tried organic hydro, but maybe the specifics of kratky would somehow make it work out.
The only problem I've had so far, was the plant just not getting enough nutrients. When I have some nice, fresh worm compost from my new worn bin, I'll try making a compost tea that includes the worm castings. I think that may be all it needs.
My root got very brown, but it was just from the dirt. Leaving enough airspace is the key to keeping out root rot. Even my bucket with the Maxigrow in it never had a problem and that ran for well over 30 days. I'll be starting the bucket again soon, trying to decide on a victim....err... candidate...