Ice bath works.
Also you can use a dewalt for stem splitting.
I am not 100 % sure this did anything, I plant on trying it again and have more accurate documentation down the road, but as far as the ice bath, I did it 3 times before harvest, 48 hours of darkness and the crystals just exploded, only thing is they are not amber and change the high if you ask me, to more sativa if you grew indica, I mean that is my opinion, if you got couch lock growing, ice bath reduces the couch lock if you know what I mean.