Unfortunately my fasttech mtl fl top fill is defective, obviously so. It's truly not air/liquid tight - hold it upside down, add water, and it comes out of the seam between the ss cap part and the plastic tank almost as fast as you can fill it. That's why it continuously dumps eliquid - there's no normal tank vacuum action, air comes in through that not-sealed seam and liquid goes out through the dvarw air inlet.
When I switched to the 5ml tank section that comes with the mtl fl, instead of the add-on 5ml top fill set, the dvarw works perfectly. Zero leaks, very good flavor, a just plain pleasant RTA.
My wicking was spot on, just the top fill was bad [emoji3]