Stillare, I love mine! Try lifting your coils and get them as close as you can to your airflow. I normally can see my coils through the holes and always put my cap in to make sure I won't short the build on the cap.
12mg is going to have some kick in a dripper no matter how you slice it. I use 6 and 3 mg when dripping, 12 kicked my azz.
Aren't you getting a head rush dripping 12mg?