Hey Caleb,
Have you ever read Thomas Ligotti? S. T. Joshi considers him one of Lovecraft's heirs and he is fantastic.
I ask specifically because I am working through Teatro Grottesco and one of Ligotti's short stories is "The Red Tower" which is superficially similar to your adventure "The Red Tower".
Did Ligotti inspire you or is this one of those strange coincidences of convergent evolution?
Even though Ligotti's "The Red Tower"...deals with a different topic I could see the story used wholecloth as a journal written by someone exposed to the horror within your "The Red Tower".
Edit: Ross if you are looking for inspiration for another Carcosa game, I couldn't recommend Teatro Grottesco more, specifically "The Town Manager" and "The Red Tower".
Edit 2:Have you guys talked about True Detective on one of your podcasts yet?