Thank you all for your replies. At the end we managed to skip the second Ghost with no problems at all. The problems were I suppose:

- BLM doing LB instead of a SMN (which we don't have)
- Being comfortable with the Heavens Fall patterns + Super Nova
- Organization between the tank and melees to keep uptime in Nael
- Ppl were not using potion/poison

Now we have to learn p4!
Cheers ^^