When adding the NaOH actually you will get voluminous white clouds of (probably) DMT just at pH 7,5+. I always thought what will happen if I would just try to collect those, but they are probably too fine to ever be filtered. Then if adding more base as you tell it will go dark - while the clouds will also vanish. So I thought DMT will for some weird reason dissolve again at pH > 10.
But that means you can still get some precipitation? Could be a nice thing, as you would not get any risk for emulsions. How does the final product look like - is it very fine dust and therefore you might spill some over, when decanting water?
And probably biggest question what is the yield?