If by "soft spot" you mean getting killed by armored units then you could opt for Atk Smoke as a C skill or even as a sacred seal. Otherwise, if you're having trouble killing them moonbow comes as an option as less impactful than Ignis but with a lower cooldown. Aether comes to mind too but, it's long you're mostly getting this to get a little bit of healing and just a little more damage compared to moonbow. Def Smoke or Threaten Atk or Threaten Def are also optional choices. I don't know what you're seeing in arena so I can't outright tell what you should do.
As for Slaying Bow, you could play around with that and found what works too if you're willing to fodder it off.
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