Just Jouni.

Exactly what you said Cam.

Only purpose to my calculation was an approximation when the tip starts to restrict the hole. I also omitted many other geometrical factors, for example if the carbs are tilted 20 degrees forwards (cos 20 degrees) and the lever turning (cos(arctan (8/27))), these drop the value to about 7mm instead of 8mm. And because of the square root law (for circle area), the metering is very nonlinear and I think the last 3mm has a very small influence. Most of the metering can happen approximately on the first 5mm level drop from the closing position.

I presume you used these formulas: area for a circle, flow on a channel which is a square root from a pressure difference multiplied by some constants and formula for hydrostatic pressure. That 2.65mm sounds what would really happen there on normal conditions and would have reasonably small effect to mixtures.