helium-4
Bluelight Crew
I don't really think there is that large of a distinction between a breakthrough dose, and very near breakthrough dose. I would say that there is a rang were the intensity of the DMT becomes extremely notable as something "extraordinary". I've had sub-breakthrough DMT trips that have been just as rewarding and overall aw-inspiring as full on breakthrough doses, they just didn't have the overwhelming (in a good way) intensity that surrounds the breakthrough doses.