Fcoil is doable as SMN but often times I think myself "This part would be 100x easier as blm". Just the MP part is annoying, having to rely on bard playing Ballad "for me", when I know as BLM he could be playing Foe's instead. Battle ress on paper looks nice, but as there are these mp issues, its not really ideal and SCH has supervirus as well, BLM would have eye for an eye, plus Apoc + Manawall + Manaward.
BLM may be easier, I dunno. I enjoy SMN, so I play SMN. I do good DPS, so it works. And NO never make your Bard play ballad for you. No, no, no.

Battle res is a fun toy, but you shouldn't ever need to use it.