After two weeks of using both blu atomizers and carts and 306A atomizers and carts, I'm totally not seeing this. I get identical vapor, though I'm getting really, really good vapor from both systems. When I switch to the 306A I tend to think, "wow, that is a lot of vapor, and it's really thick, too," but then I switch back to the blu for a comparison (same battery, same liquid), and I realize that, no, I get just as much thick vapor from the blu.
Results obtained using my own implementation of the PTB mod and full carts filled with Johnson Creek reduced-PG liquids.
Maybe when my crazy schedule settles down a bit I'll try to make and post a video so people can see what I mean. In the meantime, if others are getting better results with the 306A, great, but I honestly think I have the stock blu equipment performing just as well.