Did you clean it thoroughly before you used it?
What resistance is the head (if you know) and what voltage/wattage are you running it at?
The coil may be choking the wick, open it up and look at the coil, if it looks to be squeezing the wick, its choking.
Gently pull the wick side to side, taking care not to destroy the coil wrap, and hopefully it will loosen up and begin wicking better.