The idea of using a strictly mathematical approach was tried by community groups during the year before the GHB came out. They ended up failing pretty quickly because strict math cannot fully account for synergy and subjective abilities. If you want balanced values you need to incorporate playtesting on top of the mathematical formula, in which case PPC already has that covered and at the same scale as the GHB, no less.
You have a good idea here, but the community already tried it & moved past it months ago.
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