In general, closing off your airflow will reduce in less vape, or no vape. When I accidentally hold my finger over my airhole adjustment pin in my tank, I get NO vape. Generally, if you want an airier, cloudier vape, you're going to want to have your airholes wide open, and wattage up. But if you are using a MTL tank, I doubt that you will get the clouds you may be searching for... For that, you will want a sub0hm coil (below 1.0, sometimes severely below 1.0, LOL) and that may mean a new setup is in order. There are some headaches that may come with that, but if you are looking to compete with the clouds in the sky, that is probably what you will need.
Best of luck!
Anna