Coil Group Composition Advice

Hello knowledgeable and friendly cohorts!

Quick question, I will try to be succinct as possible. After picking up a set of three syblings unexpectedly, my Coil team is now comprised of

PLD
PLD
WHM
SCH
BLM
BLM
SMN
BRD

I feel like this is bad, lol. Question 1: Is Coil doable with that composition considering the fact that we have low melee dps and we double up on two classes for LB?

Alternatively, I am willing to switch from my i80 PLD to a MNK, and I can get the BLM_01 to switch to WAR, giving me

WAR
PLD
WHM
SCH
MNK
SMN
BLM
BRD

Which I feel is a great Coil team. Is it worth the work for me to switch? I have a MNK @ 21, but a spare Relic oil, 2k philo, and 1200 myth banked, plus all of the dps DL accessories in my bags - so he will be pretty much insta-geared at level 50.

That you very very much for your input in advance, not to be rude but I would appreciate serious input from T4+ Coil raiders, as that's the only portion I'm worried about.

Turn 4 cannot be done your first team composition. The fight has mobs that reflect all magical damage and can only be killed with physical DPS. You will need two physical DPS sources (MNK, DRG, BRD).

Your second team composition is perfect.