I have a number of Vapor4Life tanks, in both 3 and 6 ml size. All are vaping decently. The 2.O dc's are better, in my opinion, but that's entirely subjective.
However, I notice that two of my 6 ml tanks have a fitting problem. The carto's will not go completely into the base, so less of the carto sticks out at the top than it does on all my other tanks. I have taken two photos showing a comparison between the two ill-fitting tanks and another one that fits well.
I've tried putting other carto's into the two tanks in question, but all carto's do the same thing, which is to almost/but not quite fit into the bottom.
Let's see if I can put the pix in here so you can see what I mean and also comment on this. The two that don't fit right are to the left, and the good example one is to the right in both shots. Anyone?