First.....while I can't be certain I doubt you are defeating the exhaust valves. I guess anything is possible though.....
Normally, I'm in the hyperventilation camp. That's not to say other techniques are wrong or don't work. In fact, I tell people to experiment to find what works the fastest / best for them. @CHfather mentions the typical method....using this you can vary your cycle speed to find what works best for you. To me...the most important thing to remember is a deep inhale and a complete exhale (abdominal crunch) to remove as much air as possible from your lungs. Do this no matter what your breathing cycle might be.
Personally, I can't speak to Batch's method. I've never been able to bring myself to try it during a hit, knowing that I have a routine that works well for me. I do however keep it in the back of my head so if I'm caught out somewhere and only have a low flow available to me, I might stand a chance of aborting a hit.
The CB YouTube channel HERE has a few videos of my demos through the years. Making a couple of short breathing technique videos is on my list of things to do this summer.