VerdeValleyVapes, one of the few great price and great flavor juices out there (couple other companies come to mind, but that's the company I use and I love it).
You are subohming.
With a mod like you have (Evic vtc mini) you're going to either go into Wattage/Power mode which you'll choose wattage (coils should have recommended wattage if you google them or just on the package, start low and work up until you're happy). Then you can also go Temp Control if you use Nickel (ni200, not n80), Titanium(Ti) or SS (many varieties so you'll have to do some research on what your device can handle). With Temp control you choose a wattage which controls how fast the coil will heat up and a temperature which is where it will cut the power to prevent overheating.
From the sounds of it though there's something screwy. If you put a .2Ω coil in and the device is reading .59Ω you need to inspect the connections, likely somethings not making solid contact which will yield that higher than expected reading. It should be reading .2Ω or within a few hundredths, and should be closer to 2.3v at 27w. Just give it a look over and make sure things are all plugged in right. Mainly the coilhead which using another brand may not fit a snug as you'd like so you may have to tweak something there.