I recently bought a Voopoo Drag Mini. It was working fine but I think i may have messed something up overnight. My coils are the Freemax Fireluke Mesh Coil (Kanthal X1). Before when I used to take hits with the airflow closed, it worked fine and was producing a good amount of smoke. Now for some reason whenever i close the airflow off, there is very little smoke, exponentially less compared to before and sometimes it tastes burnt or very bitter/strong with little smoke. Is this some weird setting i may have changed or is it a problem with the coils or the actual device?? Much help would be very appreciated. New to this so unsure about my next course of action.