Hi Deleted User01, you are right, blending does help to get more of the kavalactones out, but remember that some were done with root and others were done with stump, the root is always strongest, the bark on the root is even stronger, that is why the hair like lateral roots are the best, they have more surface area of bark.
As you can see in the table, the fresh root provided the strongest brew and that was with kneading, I used to use a blender but I don't anymore, I just use instant or micronized, if I do not use those then I will knead it with 2 knee high stockings put together, I had to start buying my own knee highs because my wife got upset when I cut the feet off of her panty hose,

The panty hose (knee highs) doubled up will make a perfect strainer and they are cheap too.
Even after blending you still need to strain the kava and knead the kava, that is the way I do it. I do have a special grind that I have, it is a propitiatory grinder that I made, it does not pound the kava through small holes in a screen, that way will leave chunks of kava that still have kavalactones in it, simply because the cells were not broken or ruptured, my grinding method shears the fibers, opening them and exposing the cells thus releasing the kavalactones better than regular grinds, you still have to strain it, it is not instant or micronized but it is a better grind and I have not seen this grind on the market at all. Most processors will use a hammer mill to grind it into a powder, mine scrapes and shears the kava so that all the cells are ruptured, or at least most of them.
The last 'Awa plant I harvested I made it into an instant kava, the next one I will grind it with my grinder so you folks can try it out and see what I mean. As more time goes by and more of my 'Awa plants become mature, I will have more Hawaiian kava and the price will be around $30-$40 per pound, depending on the variety and other factors. As always if anyone has any kava questions, feel free to ask the kava expert--- Me.

Aloha to all.
Chris