I like WT (was never too into UnSun, maybe should re-look sometime but) but I always considered them more rock than metal; same to Lacuna Coil, a bit. Lyrics freaking you out, though?! Clearly I need to check what they've been up to in recent years! Did they get weird? Hah. I mostly remember Memories and Angels and What Have You Done and other songs around that era.
Otherwise re: the pure symphonic metal stuff, my favorites are probably Nightwish, Epica, and After Forever—the holy trio. (And tbh, ReVamp and literally anything else with Floor Jansen because I am a slobbering shameless fangirl.) Honorable mentions go to Xandria, Delain, certain Diabulus in Musica songs, certain Leaves' Eyes songs, certain Sirenia songs. I don't like the ones where the vocals are too nasal. Obviously (haha), I prefer operatics.
Re: growling, I love Soilwork (male-fronted melodic death)—Nerve and Stabbing the Drama are both favorite songs, and also The Living Infinite I (as opposed to II, lol) has one of my favorite intros to any song ever. Also, not symphonic AT ALL, but freaking *In this Moment* has gotten AMAAAAZING in recent years. I remembered them as some vaguely poppy mainstream-ish rock band ***AND THEN AT SOME POINT THEY TURNED INTO
THIS*** and I was so pleased:
https://www.youtube.com/watch?v=j-qQ_brIsfY (the bridge is my favorite part);
https://www.youtube.com/watch?v=5ZF5m-vmDzM ; this one has a lot of screaming lol:
https://www.youtube.com/watch?v=_eGcPBxQ_l8
Also I assume you know Arch Enemy? They aren't really my thing (too speedy), but their whole schtick is that their vocalist is a female growler, a REALLY AWESOME one.