I'm not sure about the specifics of cross tolerance, but I can offer my experience. I ate one X tab recently, early in the evening, and by midnight, the experience was past. I slept, and was really disappointed in the morning that I had taken the tab before drinking my cactus tea. I said fuck it, I'll take it now. It was what I figured to be a lower dose, a good introduction to mesc, and that's exactly what it was (about 2 feet of skinny cactus). Solid vibes for 10-11 hours. 3 hour peak feelings, very very good. And lots of reflection.
That said, any period gone with less stimulation, will leave you feeling more stimulated once you indulge. ie, is this pizza good, yes, but isn't this pizza SOOO good if I haven't eaten pizza in a year? To be more plain, if you haven't gotten laid in 4 years, are you likely to complain when it happens?
Since I have low supply of cactus, next time I will likely fast for a couple days and spend a day in silence/nature before indulging, to see if I can knock it up a bit.
My ego is insane, but I'm alright
The path of excess leads to the palace of wisdom. -William Blake
Lavos is a fictional character, a dream inside a dream. Don't take what he says to be true or representational of reality in any known form. He is inspired by pure fantasy.