I have never had any leakage whatsoever with a properly shaped and sized copper mesh disc. I also never get any metallic flavor, but that just might be me (although I’m generally quite sensitive to metallic flavors in water, food, etc.)

I would agree that gentle inhalation might help prevent liquid from being blown off the mesh by the air stream, but when using a copper mesh disc, a gentle inhalation doesn’t imply a long inhalation. A full dose of DMT (25-30mg in my case) vaporizes in just a few seconds – probably under 3 seconds and definitely under 5 seconds. Most of the inhalation during administration is before vaporization (getting the disc heated) and after administration  (ensuring that every last bit has been vaporized).