I did want to point out that the plant doesn’t stop growing once it’s cut. That’s why you are able to clone it. It’s still alive for a bit after cutting and it uses the last of its energy towards finishing instead of rooting. That said, 30% is outrageous and I dunno about that.
RiddleM3/RM3 has grown since the ‘60s-‘70s and uses the cob method. He loves the end product, from my understanding. It’s like an intense cure. I think you wrap it in corncob husks and ferment it in the ground.