Quote Originally Posted by EasymodeX View Post
I missed an attack on Twintania with 471 acc. RNG is RNG.
Were you attacking from the front when this happened?

It's completely possible to slip too far forward and register a frontal attack against a boss mob in Coil and miss with <478 accuracy. You should only need 458 accuracy when attacking from the side and 435 when attacking from the rear. Since MNK has plenty of side-attack bonuses you should shoot for ~458.