My girlfriend is constantly getting massive build up on coils and burning her cotton. I can go a couple months on my wicks but she is lucky to get a week out of them. I've tried different decks and coils but it is still happening. I've told her to squonk more often but it doesn't seem to help. It even happens in subohm tanks. She is vaping 3mg Aqua Rainbow Drops around 50 watts at .24 ohms. Any advice would be great .