Hey!
What quantity of solvent are you using per pull? Personally, I use a single pull with either naphtha or heptane. If I get a yield = or >1.4%, then I don't bother with a second pull. However, I am using powdered, and I don't do "cooks." If you'd like, I can include the link for the procedure that I use. It may not be practical to follow it EXACTLY. For instance: i use a hot plate and stir bar to do most of my work. It's dang-near set-it-and-forget-it. Actually, i encourage forgetting about it for a few days.... it allows the natural tannins to increase the acidity of the mix. No need to add vinegar or citric acid or any of that stuff. Truly, the only think you need is patience, understanding the pH manipulation, and recognize that surface area contact is the name of the game.
The more surface area exposure - then the is a greater likelyhood that the DMT transfers to the aqueous, and from the aqueous to the organic layer.
If you've got shredded bark, can you grind it down to at least a "powder/fiber" blend?
Here's that link, and it's not really different than other procedures other than a few tweaks that made it more efficient for my use (rare - I wrote the procedure, like 6-8 months before posting it here... and I still have a few hundred mg of DMT from that SINGLE pull.)
Low Lye approach to extacting DMT - analysis of N,N-Dimethyltryptamine in mimosa hostilis root bark :
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This is not any new discovery, but after playing around with different methods, I decided that I wanted to see if the "natural acidity" of the tannic acid was able to drop the pH to the desired range. Then, I was curious how much NaOH was "actually" needed to reach the desired pH via titration. I've been using large, single pulls for a few years, so that was not really anything new.
Take Care!
ACY