Bard acc in FCOB

I'm curious to know if I should be aiming to have frontal accuracy in fcob. In t9 phase 4, it was obvious of course that frontal was required, but I'm curious when i'll need frontal accuracy in fcob? or if bards generally just always aim for this frontal accuracy?

Sitting at 51x acc ( with kirimu pants, not with kirimu coat ) and I would like to plan for the future. Ironworks bow will hurt my acc a lot when I remove HA bow, but ironworks neck and kirimu coat could fix it. But this is of course expensive and not something I'd like to do during current economy.

Thanks for any help in advance xD

I don't know about T13 yet, but on T12/T11 you may want to have flank acc.
A common strat in T12 is to stack every DPS on the side of the boss. Regarding T11, in adds/last phase you might see a few Misses poping on the screen with rear acc.

Thanks! I guess that kirimu coat isn't such an emergency then.