House, nobody said that you're a liar. But on the other hand, extraordinary claims require extraordinary evidence (Carl Sagan?)
That is, the method you describe sounds extraordinarily amazing, with extraordinary yields (in terms of how much you can take out of a footlong cactus and this is contrary to what the vast majority of people have experienced. That is, SWIM knows that eating a footlong cactus (outer green flesh only) 2 times in his life was nothing impressive at all, at least psychedelic-wise. How would things had changed if he had boiled the cactus pieces and make the "resin"? Not much I believe.
For sure you're not a liar. I start thinking that something else may account for these results not previously examined closely:
You said (can't remember if it was in the chat or here in this topic) that you boil whole pieces of the FRESH cactus (waxy layer, outer green flesh, inner white flesh, core everything). In contrast, most of the people would go for just the outer green flesh, most often dried.
Could this be the culprit? No mescaline is supposedly found in the inner compartments, but these may contain other alkaloids. Maybe even potentiators. Or could it be that the prolonged heat treatment destroys some of the "trip inhibitors?"
I think that people should repeat it the way you did it and you should give as many details as possible on this!