I understand what you're sayin about pressure, and I agree. I don't agree about injection percent, and this is why. Not everyone wants to run the amount of injection you think they should run, and people who run run 5% water to fuel will want a nozzle that flows about a third of the water of a nozzle that someone who has the same setup and runs 15% water to fuel would want. Your little device has a build in figure that assumes everyone wants to run the same injection to petrol percent, and this is not the case. This value needs to be adjustable for people to be able to pick a given nozzle for a given setup and tune.