Gnarlie
Master of Arts
I'm sitting here zooming-in on videos of Kukkiwon-style poomsae champions, and as much as I hate to admit it, Gnarlie has a point...if anything it looks like they open their mouth slightly to inhale on the chamber, and then exhale though the nose during the technique...exactly the opposite of how I do it. Dangit.
I would be interested to hear what your instructor's views are too.
I've been working this kind of breathing into my Taegeuk poomsae over the last two years (previously I just wasn't really considering breathing, I was just breathing regularly right through regardless of movement). It's a hard habit to build.