I had expiremented with moderate/recomended doses of lsd and psilocybin before participating in an auahuasca retreat... and the doses were shocking.
This was a relatively tame centre in western Europe that had trained psych nurses in attendance. Still, the Shaman handed out monster doses... and offered a second one a couple of hours in... and again the following day.
Many traditional practices conceive of "levels" corresponding to doses, and the lower levels are not the ones associated with transformative spiritual experience.
I have no recomendations of my own.
That's what drug prohibitionists would love to happen, so they should encourage such a "wrong" experiment instead of prosecuting it. :-)
Unexpected things happen, mental states swing, and now you're in a mentally compromised state in-between reality.
There are some other commenters on here that seem to implicitly be talking about what I'd consider hero doses. I don't need high doses to experience notable differences in my ability to sense and self-reflect.