fyi whenever fitting a new coil be it a stock one or a diy built one i will ALWAYS prime the wick in advance of fitting.. the kanker subtank coils are the worst offenders imho for not absorbing juice quickly enough, so a few minutes spent dripping drops of juice on the coil head wick ports helps a lot. drop a single drop onto the exposed wick and wait fot it to be absorbed before adding another, and keep going.. Then on fitting into your atomiser fill with juice and before firing the coil close off the airways and suck on the mouthpiece/driptip, to pull juice into the wick too.