I watched all three videos. Vapers are spoiled brats. This board is a game changer in a lot of ways. Evolve wanted to put everybody in their place and they did that. I want one but what I need right now is a mod with the same endurance that I got from my iStick 50, 4400 mah.
When I was doing watts control on the iStick 50 I built 1.5 ohm coils and limited power to 20 watts. That was efficient and lasted for several days. On my current TC device I get the vape I want from 420 degrees and 20 max watts but it's single cell. I use titanium so I can build 1 ohm coils, the max allowed on the Kangxin mini (which has been trouble free). I'm expecting that the DNA 200 will let me build titanium to 1.5 ohm for the sake of efficiency and 20 watts will be more than enough maxx power.
2 3000 mah 18650s would be 6000 mah, significantly more than the iStick 50. I would use the dna200's settings to hard limit the power so as not to overstress the batteries. I would limit watts to zero when the mod jumps out of TC mode since I never use watts control any more. I want a quality tootle puffer vape with a LOT of battery endurance in a compact device, not a brick. I can live with replacable or user servicable batteries. Other things being equal I'd prefer 2 18650s if it means more endurance in a more compact space.