Thats possibly because from 30-70% of Acacia confusa's alkaloid content is NMT, which for some reason does not crystallize as easily as DMT (even though in pure form it is also white/transparent crystals).
You can try recrystallizing (and freezingg instead of evapping) a couple of times, though according to nen's tests, NMT is less soluble in naphtha than is DMT, so you may lose a bit of NMT there (which is also psychoactive, albeit less so than DMT).
Last but not least, you can also just store the oil and/or infuse some herbs with it for a perfectly psychoactive smoke. You can weigh a container and then use a bit of clean acetone or ethanol to dissolve your oil and evap on that container, weigh again, and you'll know your total yield. Then get the same amount of herbs, dissolve the oil again in some acetone/ethanol and mix the herbs and let it all evap, so yuo have nice psychoactive 1:1 enhanced herbs
