Assuming the mods lowest power is 3V, with a .5ohm coil thats still 18W, and if you are getting burning at that low a power it is most likely your wicking is not up to the task.
Wicking is critical to getting a good vape and not dry/burnt hits, if the wick cannot soak in new juice faster than you are vaping it, it goes dry or burns.
I find having the wick fairly tight in the coils but loose and fluffy in the tails also keep the tails as short as possible.
As for coil host spots, you should have checked this Before wicking and vaping, basically, once you have built the coil on the deck, put it on a mod and turn the power down low (about 10w) then pulse fire until the coil glows, it should start glowing Orange in the middle of the coil before spreading out evenly to the ends of the coil, a hot leg will glow at one end of the coil or the other, i recommend watching a few build videos on youtube to teach yourself.