I have a subtank nano that I got 2 days ago. It's my first subtank so this could be user error. I've tried every wattage and airflow size and the only way I can keep from burning my lips off is to have around 15w and fully open air flow which I don't feel the throat hit I want. Got my aspire tank today and I have it up to 30w Ann 1st air hole and it's great. What is wrong with my nano?