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You're correct on the evasion observation on the level different.
Levels different doesn't necessarily affect defense, it's just that level advantage gives a damage boost, I don't mean stats, I mean a straight up damage boost, it affects every piece of content in the game, so if I put a level 10000 binah with the same stats as a level 1 binah, chances are you couldn't even damage the level 10000 one. So yeah, it makes sense that evasion is effective because it avoids the hit completely.
My tsurugi dies 3-4 seconds into the fight. Her purpose is for their Hanako not to kill my backline, that's pretty much it, her passive skill needs to be maxed (the speed boost one). That's all she's supposed to do, because of her getting to the middle early it messes up their team's positioning which means that even if sHanako aims at Yuuka in the middle, it'll still not hit your own sHanako. But you need to pay attention to their formation, if Shun is not in A1 (the fist visible slot) then it likely won't work.
Another suggestion I have is using sSerika, she's ridiculously expensive but her range is pretty large, I wanted to try her out in pvp but I simply have no resources to max her out, in theory she should reach shun, she also has cover bypass and max accuracy so she should always hit the backline, problem is, is it enough damage to kill anyone considering your situation?
Level difference aside, there is basically one issue here, you lack both the key units (sShiroko and Shun) and you also lack low cost students to make up for it.
So the key problem truly is shun, you don't have a reliable way to get rid of her before she nukes your team, and the level difference means killing shun is way too hard of a challenge.