It isn't implausible that he's seeing what he's seeing, and that adding wraps made it better (it - not fixed, but better). With any sort of additional resistance in a TC circuit (ie - over and above the coil itself and the expected resistance from the tank/RDA) you'd introduce an error in the TC "math." I know the DNA boards (and probably the Yihi boards) expect some value of resistance for the tank, but I don't know what it is. Anyhow, adding more wraps to increase the base/cold resistance of the coil would reduce the error, might even make it OK to vape. The real fix, of course, is to disassemble and clean every threaded connection in the tank that conducts, the first step to that is to use something to measure ohms, put a coil in the mod and measure, and then short the posts and measure. There's the 510 threading into the mod, the threading of the positive post into the block (the old Russian 91's had a threaded connection into a screw which threaded into the block for an extra connection), usually a threaded "cover" onto the base (which has the 510 threads at the bottom), and the connection points for the coil at the least. I use Aqua 2's and have to pay attention to that "cover," as the threading to the base likes to come loose and mess with even the resistance seen on wattage mode.
Thing is.. I didn't need to clean or anything, and this was on any of my single coil tanks... just did more wraps, stopped caring about my ohm reading and everything works now with 0.4 to 0.9 coils. Note that the same tanks and mods worked just fine with NI200 regardless of the ohm reading, so it wasn't a contact or tank/base resistance issue.
You're basically confirming what I've been saying... more mass, less error, the mods weren't able to read before, and now they can.
Maybe not the most elegant "solution" that some would want as they need something to prove, but hey, sometime the solution is simpler than we think.