Also, to answer your question about the DNA devices, here is my stance on them. Note I have only had a toot or 2 off of a dna device. Outside of battery consistency and a nice flat DC curve all of these devices hit the same. Sure the DNA's limitations are higher, and they can go lower ohm, thats great, but for an average vaper on a 1.5 ohm coil, you're going to get the same performance out of a provari or a dna at the same settings.
THe DNA and the provari curves look about the same, the provari seems to be a bit more accurate (getting exactly what you are asking from the device) The DNA's seem to hit a bit higher than the power level they are set at but its not drastic.
The thing that really chaps my ... about DNA devices, is you're overpaying for the Tube/Box. Sure they're low production (the most popular ones anyways) and sure many of them are hand made, thats great! I appreciate good quality worksmanship, but anyone can buy a DNA 30 for like $50 and put it into your own project box or tube.
With china producing full mech mods for $20 retail, it ticks me off that these DNA 30 modders are charging the cost of a provari, on top of the dna 30 chipset for a box/tube.
Also, the DNA cannot regulate the battery power down. Not that this is a big problem.