Thanks for the suggestions, fellas.
Eden, I tried that after initially dissolving in acetone, but the particles were so fine that they shot up into the pipette whenever I would get close to the sediment. I didn't want to leave all that good DMT-laden acetone behind, so I tried several unsuccessful filtering methods to get the rest.
Amor, I had lots of fun with trying to wash the goop with water, but when it would dry I kept seeing white deposits everywhere. I used a LOT of sodium carbonate. Jorkest's Tek calls for twice the weight of sodium carbonate as DMT-fumarate one has after FASW, and I compensated for potentially up to 15% of my sodium carbonate being water by dividing the amount of sodium carbonate Jorkest called for by 0.85. That's about 7 grams of sodium carbonate (and the fumarate weight was likely between 2.5-3.4 g, if the big scale I was using rounded to the nearest gram).
I think I will try "THP." I don't know what that stands for, I'll have to look it up, but it sounds effective. I dried my acetone according to the information that you supplied the Nexus, i.e. with thoroughly cooked Epsom Salt added and shaken, not stirred.
I realized after I put my head on my pillow to fall asleep that mixing the xylene with acetone and water would just be unnecessary... the xylene would free up the particles (it's a solvent, too!

) AND not mix with the water. I can only say I must've breathed in too many solvent fumes yesterday - my puzzler wasn't puzzling very precisely.