well it's too late, the mix was made and is sitting for 4 weeks. and btw, you didn't show me any help at all, my friend; i'm not trying to be rude but in no way did you help lol. and yes i agree, i'm not paying 40$ for cuft. of biochar.
i see plenty of comparison grows while googling that no one mentions anything about "activating" their char, and if they do, they're referring to charging. I'm not trying to say that the way i'm doing it is correct, but it's the way it happened. live and learn.
lots of the things i read, the people are making the char in an o2 free environment and nothing more just like the cowboy charcoal is made. if "activating" were such a huge deal, i feel like there would be a lot more references to it, and the difference between activating and charging.
even still, if the CEC of the biochar i made is low, then it's obviously just not going to help, but can't see how it would hurt the situation either. besides, 30% of my mix is pumice, which has better CEC than scoria. glad i mixed the exact same mix, one with char and one without... these will be AACT and water only. i will see the difference for sure, or maybe there will be none at all!
next biochar i make i'll be adding to compost to charge it. and maybe i'll do one with the cowboy, and one with charcoal i make from fire of my own to see the diff.