Interesting, can't really comment either ways as to my thinking at the sorts of pressures used I am not sure how much flow comes into it, but it must for some of the aperture modifications made to have an observable effect, I too opened out the poppet aperture to 1mm, and I have noticed a decrease in shot to shot air use but nothing else, and will be getting another poppet so I can experiment further with a larger aperture, which also says that the size of the hole does matter, and while I used to know my airflow characteristics when tuning cars I am, not sure about the high pressure stuff, but its people like us who are prepared to take the risk and try this stuff that make gun tuning interesting, so well done for being adventurous.