Couple of things...
1) Ifrit only does magical damage now, they changed that with HW
2) I'm not a level 58 Summoner yet so I can't compare personally but I have heard call to save Raging Strikes, Tri-Disaster, and Contagion for Dreadwyrm Trance rather than using them right at the start of the pull, and it seems like a good idea to me at least on paper.

Don't mind me, my main DPS is SMN but I'm only just now starting to level it past 50 so I'm trolling about every smn-related thread I can find :P