Once the majority of the tank leaked out was able to vape a bit on the prejuiced wicks. Not sure what the coils from the factory are wrapped to but the rta hits awesome. Way more throat hit than my derringer and I can really easily adjust the airflow. Wide open it is way more airflow than I am used to. Wide open it hits hard! Flavor is fantastic! I am thinking maybe my wicks are too big. wish there was a way to see inside there to see what the issue is.