I have been using a Protank 2 for months now, but recently, it seems like the airflow is restricted (new development) and any coil I put in is seems to be too tight as well to the point that I cannot prime it well. I have taken a safety pin to the air holes in the PT base and cleaned and cleaned and cleaned it. Maybe it's me that has changed so much, but the mini protank is outperforming the big one by miles. In any event, I no longer want the Protank to work, I am looking to try something else out with a larger capacity tank. I want your recommendations! 