I don't think you will like that tank... very restricted airflow (tight draw) Also, I would have guessed too much PG but your juice is high VG so that's not it (or nic...12 mg is reasonable) I would have also suspected too high of watts but that's not the case so I'm kinda confused as to what is causing this. When you vape, take small sips of water (this is very important) What flavor is the juice (sometimes it's just a certain flavor that irritates your throat)? Do you "chain vape", do you pause between vapes, do you keep the airflow at least half-way open or closed down tight? Lot's of questions but that's how we figure out issues... the more details the better

There is a chance your tank is "flooding" (gurgling) and you are getting "mist" instead of "vapor"... the nic will be harsh and can even feel like it's burning.