In my opinion the fight is way too easy now. When half or more of the party typically goes in with 360+ ilvl and 40k+ HP, its actually quite difficult to die, where with i290 and ~26k HP, any significant mistake put you on the floor. I would have preferred if they had set it to sync to around 310-320 instead. Honestly, I see more wipes in Susano and Tsukuyomi now than Shinryu ever caused, even when it was new, simply because you can't just outgear them and ignore everything.