I have heard some folks talking out of their A** and that might be where they breath as well!
Butt seriously!! If I was not having issues I would have one of the minimal jackets with flotation lower! they are great for kiteboarding and kayaking! especially when you are trying to get your head above the surface when floundering! It's like sitting on one of those foam noodles! not much there but really helps one float hi.
At least that's my take on it!