Black Mage Sanctuary - A Guide to DPS

[Lilyth]

This is incorrect. Casting Ley Lines pre-pull will be a better PPS increase. If you aren't using a potion, you are then weaving RS under a FS proc. Trust in that I've done the math a dozen times. The only time you would not want to cast LL right before your first spell, would be if you cannot be prepositioned.

I'd really like you to further clarify why.
If you place the oGCDs like you suggested, you're exchanging the first AF1 Firestarter proc under RS for an AF3 Blizzard III. That doesn't sound promising.