I prefer to refer to the DMT resin as "DMT condensate" bearing in mind that what you're retrieving at the bottom of the bowl is as much DMT as the DMT you initially loaded up except it's either melted, run off and solidified, or the smoke is cooling and condensing onto the glass. The odd unexplainable thing, is that I too have found it to be more potent by weight than one would imagine possible. Keeping in mind that the DMT is flat out unpredictable in the first place coupled with some confirmation bias, and you've got a pretty strong argument against its potency, other than to say that out of my numerous experiences, some of my strongest ones have been off the DMT condensate, even though it would only be small amounts.
If you can designate a pipe for just DMT, then reusing it will most likely become even more potent cause you can simply run a little isopropyl alchohol through the pipe, swish it around and collect it in a bowl (i.e. something you would normally eat out of), and let it sit still in a well-ventilated area for a few days while the alcohol evaporates. When it does, you have some super potent crystals to scrape up and reuse. It was when I was on ayahuasca that I decided to smoke some of the DMT condensate that I received my first white light experience culminating in an encounter with the godhead. It was a negligible amount too. Perhaps 15mg. Congrats on the first post, and welcome to the Nexus!
"Science without religion is lame. Religion without science is blind" - Albert Einstein
"The Mighty One appears, the horizon shines. Atum appears on the smell of his censing, the Sunshine- god has risen in the sky, the Mansion of the pyramidion is in joy and all its inmates are assembled, a voice calls out within the shrine, shouting reverberates around the Netherworld." - Egyptian Book of the Dead
"Man fears time, but time fears the Pyramids" - 9th century Arab proverb