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In addition to my previous explanation on how the gas cycle of modern GBB's work:
Once the floating valve is closed and the slide begins moving, the valve knocker will keep the magazine's release valve open for as long as it takes for the slide to blow back to a certain point. This trigger point is indicated via the ramps on the blowback unit in the 1911/Hi-Capa, Glock series, Sig series, and more. Thus, there is no such thing as splitting the volume of gas between one function to another, because the volume of gas expelled is not fixed. The amount of gas expelled is dependent on a number of variables, all of which, determine how fast the slide will blow back. The faster the slide blows back, the faster valve knocker disconnector is triggered.
And likewise, the slower the slide blows back, the more gas is expelled in to the chamber (nozzle).
There are existing experiments with stronger floating valve springs... I even have some in some of my guns, but in my experience, more often than not, they just don't work that well. It creates too much resistance for the negative pressure system to overcome, and it results in excess gas being shot out the muzzle, and very weak blowback.
... reading over your reply again, I think you actually just described what I described, but in a different view. It makes sense.
There are high flow floating valves available for the 1911/Hi-Capa series, which, as you've described, is just a reduction of columns in the body of the valve to increase the volume of flow. I have a few on hand, if you wanted to give them a try, but in my opinion, there are better things to spend money on first if you are looking to increase power.
Anyways, Guarder nozzles... suck. I've cracked a few in the 1911/Hi-Capa series. I only have one remaining one which has held up strong (surprisingly). My personal preference for nozzles are the Shooters Design POM, or the Airsoft Surgeon product.
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