So lately people insta drop when DF doesn't provide SMN or BLM. This is a waste of time, try the following
Pretend the nails are a square
all DPS attack bottom left nail while strongest DPS LB3's the top left nail and then moves to help other DPS (one tank may need to assist depending on total DPS power)
Everyone kills bottom right nail, just before it dies LB DPS moves to top right and fires off the second LB2 is available
DPS chip in if needed
seriously it's not that much harder than BLM LB strat. Give it a shot at least once.
The biggest issue is people start attacking the LB (top) nails and wasting their dmg.