Yes GO has some humic acid in it, an organic chelate. GO has been mostly mineralized (digested by bacteria making it plant available prior to bottling), so yes it acts "similar" to a chem nute (instantly available). However unlike a chem nute you gain a slight buffer to over feeding because part of the nutes still need to be broken down within you media before the plant can use them. Just to be clear not all chem nutes are chelated (i.e. GH flora series). You probably know that, but others might not. You are right that running bennies with organic nutes is a bit more effective, but unless you are recycling your media the difference is negligible. I have read running chemical chelates will kill off most of your bennies however, so that's something to consider when choosing base nutes. As far as soil vs coco, it simply comes down to more air in the root zone causing faster, more robust growth. There is a reason aero produces better than any other method, at least in a perfect world.
. I add them in the form of ful-humix (was humisolve) and also ful-power (fulvic acid) to both organic and chem grows. Really good stuff IMO.
