Amberthefrog said:So basically I’m asking has anyone got considerable (i.e. at a range of different dosages) experience with both P. cubensis and P. semilanceata, and if so how did they compare?
I've got a lot of experience with both and couldn't really tell you any difference. But I do agree that high dose and low dose mushroom trips can vary a great deal.
Whether the other alkaloids make any difference I'm not sure - the theory is psilocybin converts to psilocin in the body anyway so psilocin/psilocybin affect you in the same way. And as for whether the brain can detect the tiny amounts of norbaeocystin while it's being overwhelmed by psilocin - I doubt it.
I think the key is to capsule the cubensis and the semilanceata, then ask someone else to put them in different jars so you have no idea what you are taking and then see whether you notice any difference. If you know you're taking cubensis then you already have an expectation which will massively affect your trip.