My logic says the more oxygen you can flow in and out the more your body can use it up.
You suck up some air, all the oxygen gets sent around your body, you puff the air out again without as much oxygen in it ready for delicious new oxygeny air. The greater the flow the quicker you can inhale and exhale the oxygen.
The rate limit is your body's ability to use it though, not suck it in.
You're already sucking in more than it can use, ergo, making the holes bigger ain't gonna do jack.
[prepares to be exposed as an idiot]
My logic says the more oxygen you can flow in and out the more your body can use it up.
You suck up some air, all the oxygen gets sent around your body, you puff the air out again without as much oxygen in it ready for delicious new oxygeny air. The greater the flow the quicker you can inhale and exhale the oxygen.
No?