Optimizing crit on Hayato

Assuming no other funny stuff like Thief card set, your crit damage range will become 1.2 ~ 1.65

Hayato's "base" critical range, "base" in that it's passively increased by a second job skill (Unfaltering Blade adds 25% min/max), is 1.45 to 1.75. With decent SE, it becomes 1.45 to 1.9. Hayato's own card effect is +2/4/6/8% Min Crit Damage. The damage increase from +10% Min Crit is actually between 2.9% and 3%, depending on what your Hayato card adds or if you even use it at all.