Ixion's rough if you don't have the power to get through rage quickly, as then you're just stuck there due to her raging overdrive's side effect. I remember having trouble with that back in the first run, as she was the first ragnarok advent, wasn't she? But yea, after a certain power point, Ixion's a lot smoother compared to some others.
Still noticably tougher than Yatagarasu ragnarok though. I still think that's the ragnarok with the lowest minimum power needed to consistently clear.