Is my SMN rotation okay? (video)

[Spellbinder]

Since this thread is talking about the opening rotation, a quick question if I may.

Raging Strikes -> X-Potion of Intelligence -> Bio II (Start precasting it when you see your tank about to engage) -> Miasma (Start moving toward the boss at 0.5 left on the cast) -> Bio -> Fester (when Bio applies) -> Miasma II -> Potent Poison Potion -> Contagion + Swiftcast -> Shadow Flare -> Rouse -> Ruin II -> Spur -> Ruin II -> Fester -> Ruin II -> Enkindle -> Ruin -> Ruin -> Ruin II -> Fester -> Ruin II -> Aetherflow.

Excluding the potions, this is the rotation I've used pretty much since the game started (although I still long for the day they add an /item macro command). I've always been curious though, why the X-Potion is used after Raging Strikes and not before?