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Again, people are talking without knowing the math. PSI is not weight. 2 pounds is 16% but pressure is parabolic. You have to use a different equation to measure how much less it is.
I'm not sure what you're trying to say there, but the issue is that there is gauge pressure and absolute pressure; the gauge reads only the gauge pressure (i.e., the extra pressure of inflation), while calculations generally require the absolute pressure (i.e., all the pressure within the ball).