Notice the context in which you ask the question:
We have been for years working to not only try to create a good reliable base of knowledge regarding dmt and allied substances, but also to generate a respectful attitude towards them too. We dont want to just teach people how to extract and then some random kid just 'sucking' the knowledge and going off to extract hidden in his parents house or dorm, or someone with doubtful intentions extracting a lot to sell for profit, or even well intended but naive people that extract too much and give away too easily to others who will take it lightly, and then someone might have a very bad experience, freak out, hurt themselves physically or psychologically (or during the extraction). This all can lead to police, media, more negative attention to the community.....
We know we can't control what everybody does, and we dont suppose to. But im just explaining to you where the other answers are coming from. Its an attempt to try to generate rightful awareness towards it.
It might be that you're genuine, that you are very careful about who to introduce it to, and how to introduce it, that you are respectful and would never sell it. In that case, truth shows, and your karma will pay itself of, so no need to worry. But it might also be that you are not, that you are either selling it, or maybe have so much that you are not as careful in the introductions, or even that just the fact you are buying more materials/making bigger extractions (and talking about it on an open forum) will attract more negative attention. So because of this, its our duty to put it in question. It would be strange to expect something else from us. One of the things we stand for is critical thinking, self-questioning, and this is not meant as a personal offense to you, we all should self-reflect and put our own behavior constantly in question.
With that being said, the answer to your question is: "There is absolutely no issue with adding lye after adding mimosa to water. The reason for low yield must be something else (probably your solvent is not saturated enough to freeze. Make longer pulls, mix better, and pre-evaporate. Check
FAQ "
But appart from this, this generates in me the realization that, if you dont understand why it wouldnt be a problem to add mimosa after adding lye, you are most likely not understanding the principles behind the extraction. It is very recommended that when one extracts, one doesnt just blindly follows instructions but understands why one is doing it. Therefore I suggest you to read the
FAQ overview, explore the
WIKI and read many of the teks (just scroll down the main wiki page) to understand why things are done.