Yes, I did it twice - did it in my third and fourth run, haven't runned it since :-) I want 4 drakes, tho!
EDIT:
I am only running 4 shamans, tho .. so we're not in the same shoes!
I haven't experienced the hook going into grounding, I tend to heal it up and bop one of them. Chrono is pretty much NUKE, I use my fire elementals here and remember to hug him, his charge will kill you otherwise. Watch out with healing, he can hit pretty hard.
Infinite is tank'n'spank as you said, but WATCH your tanks health, keep it 100% all the time .. He does a 80% blow, which is totally insane
And GL
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