OK, so the simple water extraction (Grind bufo seeds, boil, strain, basify, evap) turned out to be inactive, perhaps because SWIM didn't extract with acidic water or because SWIM was very sloppy in technique.
SWIM tried again this morning, this time with acidified water (he used some vinegar). He then took the result from that and did a limonene boil on it. The result from 10 seeds (2.2g), was ~40 mg of pale tan powder, seemed somewhat less fluffy than his DMT. He bioassayed 15mg of that and HOLY F-ING CRAP. It was difficult to make out reality because everything was sliding and patterning and morphing. Things were forming in the space in front of SWIM and three hours later there's still traces of patterns. None of SWIM's previous extractions came even close to this, the d-Limonene step seems almost magical to him. Not very euphoric, more calming, peaceful. No nausea was noted, though SWIM's face prickled intensely (almost painfully) through the come up (Is this still the toxic alkaloids, or is this part of bufo?).
SWIM plans next time to try extracting using a basic water, as bufotenine should still be soluble, but it will permit SWIM to skip the basifying step. SWIM wonders if there's any danger of the bufotenine forming sodium bufotenate should he use sodium carbonate as his base. He knows that it seems bufo does not form a stable calcium salt, but sodium is much more eager to form salts than calcium is.