I have a DNA 40 mod with dual 18650 in parallell. It is that brick of a mod called PVA 40, which the YouTube reviewer "Peg" from Pegasus vapor Academy said he made "For the people, by the people" https://www.youtube.com/watch?v=MU3GteeXRf8 It reads lower ohm than any other mod I have and had, and it feels like it performing weak. In watt mod with kanthal it's ok, but in TC it's a mess. Unfortunately it have the small dna 40 screen. What I wonder is if I could swap the old chip with the DNA 60 with small screen? Because the housing off the mod is built like a tank and on my desk it could serve good with proper TC. I like ss 316 single coils the most. Although Nickel and Titan is ok too. The Vapor Shark Flask DNA 40 perform like it should and is a much better vape with NI200