Conan, one of the best soundtracks, and I agree it's the best of Poledouris. And you can't mention that movie without mentioning the Prayer to Crom, right?
There is also a ton of Lovecraft-inspired music on youtube, there are so many that I hardly could check them all out, but one composer that I really liked is Graham Plowman.
I'll check the rest of your suggestion tomorrow, it's late now here, kids are asleep!
Love the atmospheric lovecraftian music. Cryo Chamber youtube channel has some good stuff. I included one of the mixes (Yog-Sothoth 1) in this post and always find more in the recommended list. I'm sure you know but some people don't realize there is a cool connection between Robert E. Howard and Lovecraft.