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The "+" is currently used when the Attack Potency has been calculated to be greater than the arithmetic mean of the high end energy level and low end energy level of a particular tier.
However since in fiction we're usually dealing with multipliers geometric mean of the high and low ends would probably make more scence than the arithmetic mean.
For example we have 15000 J as the 9-B baseline and 9-A tier starts from 20920000 J. Using the arithmetic mean the "+" starts from (15000+20920000)/2 = 10467500 J. That mean in order to reach "+" a baseline Wall level character needs to become 697.8333... times stronger but a Wall level+ character only needs a 2x power up to become 9-A.
That's why I think geometric mean as "+" baseline would be better to use. Using the geometric mean the Wall level+ would start from sqrt(15000*20920000) = 560178.54 J. That makes Wall level baseline 37.345 times "weaker" than Wall level+ which is 37.345 times "weaker" than 9-A.
TLDR: Geometric mean works better with multipliers because it keeps the same low end to high end ratio for both halfs
However since in fiction we're usually dealing with multipliers geometric mean of the high and low ends would probably make more scence than the arithmetic mean.
For example we have 15000 J as the 9-B baseline and 9-A tier starts from 20920000 J. Using the arithmetic mean the "+" starts from (15000+20920000)/2 = 10467500 J. That mean in order to reach "+" a baseline Wall level character needs to become 697.8333... times stronger but a Wall level+ character only needs a 2x power up to become 9-A.
That's why I think geometric mean as "+" baseline would be better to use. Using the geometric mean the Wall level+ would start from sqrt(15000*20920000) = 560178.54 J. That makes Wall level baseline 37.345 times "weaker" than Wall level+ which is 37.345 times "weaker" than 9-A.
TLDR: Geometric mean works better with multipliers because it keeps the same low end to high end ratio for both halfs