That third Tervahäät song was pretty good, but the first two were a little too typical "Hitler Youth haircut neofolk" for me.
Waldeteufel sound pretty close, at least on that album (from the samples I could find). Some other stuff seems too industrial-based but they're still worth checking out for sure.
Wolfsblood are alright but I'm not really feeling that spoken word vocal approach.
Gyuto monks are great but the percussion is a bit too free-form and beatless - if they had steady driving drums under the chants and maybe some of those melodic instruments alongside rather than between the chanted parts that'd be ace. I'm very familiar with Huun-Huur-Tu but they're often too merry/playful if you know what I mean.
Halo Manash and Arktau Eos are both too formless. I don't mind evil/grim stuff but I guess I'm just after something that emphasizes the rhythmic elements and melodies a bit more than going for that pure evil atmosphere I guess.
Here's a Wardruna song that is doing a bit of what I'm after:
https://www.youtube.com/watch?v=GQA7RQEo-ss