I have a lemo 1 and a Kanger Subtank mini. No matter how I wrap my coils or wick my cotton, my airflow tightens up on me mid vape. When I hit the button and fire up, halfway through my vape the draw is cut in half and will stay that way for hits and then open up briefly before tightening up again. Without firing the button the draw seems fine on both. I'm using an ileaf 30 and an ileaf 50. They do this at all wattage. Running 50/50 juice. Any advice?