This might come off odd, but I fought in a bar grill for many years. This last year (June) I had my knee broken during an unbelt practice so I had some time to sit out. After the Doc's sign off in October I'd shifted my harness and visor over. I'd fought in this visor for a couple of Combat of the 30's so I was already 'comfortable' with it. After Oct, I started working on making it my 'primary' part of my helm. It was a tad odd, but what others have said (and Duke Rangvaldr pointed out) giving moving one's entire head instead of trying to track things with just your eyes really was panning out.
**It might look freaky, but tracking your oppenent's weapons with your entire head/sight no matter where they moved it was like watching a raptor. Silly as it might seem I can follow/track a shot/feint with my entire head/helm faster than most could begin to move their arms/hips to get the shot in. I didn't believe I could at first, but when you have a multiple duke pointing it out over and over again, ya start to understand what they're doing inside their helms as well.**
This past week and weekend I tried going back to the bargrill visor ... after the fact analysis let me know it was 'too much' info/input after just a few weeks of adjustment to a footman's visor. I'm going back to the full face visor and the 'head work' ... it helped me focus, and get my noggin' out of the way of various shots. As for breathe .. I found the breathing battle was more with me wasting energy and effort with shots/blocks that I didn't need to be doing and wearing myself out. Once I'd focused and stopped letting my opponent wear me out (i.e. control the tempo of the bout) ... I had oodles of breath ...

Just being a smart ass ... I'm 6' 2" @ 250# ... and yet Black Oak scares me ... !!!!
Guess his height .. and the fighting of a pissed off rabid weasel using that thing is part of it!!!!!!
"Difficulty is the excuse history never accepts." - Edward R. Murrow