Oh ... I almost forgot,
I think that it is really cool that you like dark ambient music (especially Desiderii Marginis and Vestigial).
Did you ever listen to a project by a composer by the name of Kim Cascone called "PGR" (a.k.a. Poison Gas Research)? If not, then I suggest that you do.
Here is a link for the album called "The Morning Book Of Serpents" entry over on Discogs:
[link]Track # 07. "Floods And Chairs" (10:03) is particularly outstanding ... listen with headphones in a dark room.
Once again, best wishes.