1) "Because you're acting as if PLD and WAR have the same base damage before multipliers, which they do not. A WAR has a fair deal *less* damage pre-multipliers because PLD has Circle of Scorn and Spirits Within." Do you even consider the stats of Shield Oath?

2) "PLD (without WAR) & PLD (with WAR)"
Your calculation is weird, explain to me what's the meaning of PLD(with WAR) Are you referring Cross Class Skills? And what skills from WAR that a PLD will use?

3) "Tank stances double enmity generation. Crits generate an extra 50% enmity, so the crit bonuses are 50% higher." Please give us more details/information regards this.

4) "Maim is a 20% increase in damage on a permanent basis. Storm's Eye is a ~11.1% (1/.9) increase in damage dealt, but it applies to both PLD and WAR if there is a WAR present." You expect a PLD to equip with heavy swing + Maim just to get a 20% more damage?

There's still a lot questions in your post.