You can use a +10 upgraded curved sword with Quelaag's soul to make the Furysword, which is a Chaos weapons. It does a lot of damage at 10 humanity but has no bleed effect. So you could grab a Falchion or Scimitar from somewhere and upgrade it to that and upgrade your Uchigatana to +10 Fire or Lightning. That way you don't use up precious red or green titanite getting your Chaos weapon.
I think at 10 humanity, a +5 Chaos weapon beats a +10 Fire weapon in damage, so the humanity is important. And yes you do recover humanity when you grab your souls back.
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