Tesla D2

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I recently purchased a tesla D2 dripper to use on a Sparta mod clone (26650). I've used 26g and 24g kanthal at approx. .4 to .5 ohms, I find the vapor and flavor to be very lacking. I have researched the mod and a lot of people comment about the voltage drop on the Sparta. I've used a serpent mini and Baby beast, they all work pretty well.( other than the fact that it is God awful ugly on this mod) Does anyone have experience with the D2? Any suggestions?

Tesla D2