Which artifact should I use?

Okay, so I've been trying to build Furina but it hasn't gone too well.

Artifacts are my main problem. I was reading the "ocean-hued clam" artifacts and thought that if I turned Furina into a psuedo healer/ DPS that it would work out due to how much she heals and how fast she heals. Maybe accumulating the 30,000 hp in that 3 seconds is not quite good enough though.

But I was also looking at the "Song of days past" artifacts and noticed that the artifact set works somewhat like how Furina's burst works. (Or at least, my understanding of it). I currently have the "golden troupe" set on her right now but I'm unsure if the artifact works well with her build.

Any ideas as to what I should go for?