User blog comment:Hayashi H/Spring 2016 Event Guide/@comment-26486243-20160526123752

So far in 29 attempts on E7 Hard final, 4 reached boss, where one wiped out the escorts leaving 74 HP on the boss (chikuma taiha and couldn't fire), one ended with 5 escorts on single digit HP and 200 HP on the boss, one ended prematurely in day battle since both Chikuma and Tone took initial torpedoes leading to instant taiha, and the last resulted in 3 ships surviving to night battle, where all friendlies focused on that one escort in good health.

All had twin support and fully sparkled lvl 97-99 fleets, and most were taiha due to ridiculously unlikely causes (CVL oneshot by Tsu in Green T preboss, flagship akitsushima taiha'd in aerial node, Tsu with 1 hp above chuuha taiha-ing yuudachi at preboss, yukikaze taiha by So standard (the blue one) closing torpedo, CVL initial airstrike taihaing Ryuujou...

I would assume that for most players with bad luck or above, they should reach the boss about half to 75% of the time, but my luck is screwed up in every single case luck is even slightly involved in anything at the moment. As a result I consider it extremely unlikely I can clear Hard this event. 2 attempts remain for today, then I must downgrade to Normal or risk having too few resources to clear 5-5 on 31 May.

The E7 Hard Final composition cannot be assumed to work. I'll leave it up there since it should be the strongest possibility from a theoretical point of view, but results in practice have NOT agreed with the theory in my case. Maybe it'll work for someone else, maybe my analysis is off somewhere. But I can't guarantee it works since I'm not even reaching the boss now.

Good luck to anyone else who has at least bad luck.