You may want to try the V4L cartomizers. V4L vents through the battery so to use V4L cartomizers with 510 you need the 510 to KR808 with the vents. I have am going to order it because all my research says that the draw is not as airy because V4L vents through the battery so those cartomizers actually have to have the vents in the KR808 adaptor.
