You could always filter it off anyhow, then see how much of it dissolves in fresh EA. "Up to" 1.8% yield would be very respectable, and seems plausible if it was from that
lovely cactus of which you shared pictures. It looks extremely similar to a lineage I know to be highly potent, and from what I gather, M fumarate tends to be on the powdery side.
You may want to chance being cautiously optimistic here