This is the general state of mind regarding this subject. I, however, am a veteran on growing cannabis and I know what I am talking about when I say the 10%-15% meals can be further broken down before they are added to the medium. I would not suggest it if I was getting poor results, if you think your results are better, that is fine, don't judge mine - please.
I have tested the act brews for many years. I have found that if I brew the organics for weeks, they stabilize the pH to 7.8, due to pathogenic microbes. The large amounts of citrus acid during the last week of brewing will kill the putrefaction and reduce the pH to around 4 or slightly less, depending on how strong the brew is. This will do an acidic sterilization and the citric acid will convert via the Krebs cycle into more usable microbes, nutrients, and elements. When the pH begins to raise again, I add crushed elemental sulfur. After a couple more days, the pH stabilizes and holds at about 6.4 or so for my medium. The pH needs adjusting with citrus acid about 1x per week, it goes off by about pH0.1. The citrus acid restarts the Krebs cycle and gives an immediate form of pH down. Keep in mind, citrus acid is pH 1.4. so it`s fucking heavy shit...
Some jackass actually suggested using the acid from a lead battery.. What a dumb fuck.. LEAD POISONING!
The Coir / Perlite medium is ultra light, a half-gallon pot would have a wet weight of about 2 or 3lbs - This is too aerated for anaerobic microbes to live. My "tea" is black, the res water is black, it does not smell like death or shit, it works.