You should test Barbed Crescent extensively because a quick check of the spell against fully leveled Abyssea mobs suggests that the floored accuracy does not apply to said spell anymore. Although only one cast landed the debuff without cruor buffs, using cruor buffs (No atmas) seemed to have a consistent landing rate. The difference between no cruor buffs and cruor buffs is roughly 35mACC within Heroes zones. If that is what's necessary to land some of these spells now, that's much better than floored magic accuracy. That said, needs more testing, but the preliminary results look great for barbed crescent.
Link please though understand I don't trust anything from inside Abyssea, especially as crour buffs shouldn't have any effect on the proc rate of an additional effect on a WS, which is all Physical BLU spells are. Crour buffs are just HP/MP and + states not +magic acc (unless your talking atma which is different).