We've parsed strongholds and hundreds of Ifrit fights with melded Hart NQs, +1s, and a +2 vs. Ifrit's Harpoon. Base damage far outweighs any benefit from one Savage Might materia. Inflated crit rates during Ifrit fights occur due to player choice as to which WS they apply Blindside to; regular variance also applies. Savage Might definitely does not boost crit rate by 20%.