Not sure if you want to change your label to better market you work, or if just interested in other opinions. But here's my five cents.
Thriller - Short rare bursts of violence/action or dark topics.
Suspense - Prolonged dark topics and mood but with very little violence outside the climax.
Horror - Plenty of in-depth violence, dark topics and even supernatural themes.
When mixed with sci-fi Alien comes a bit to mind, but also The Riddick series (Novel: Pitch Black): is for example called: "A fantastic futuristic thriller of a deadly new frontier."
Maybe Sci-fi Suspense would free you from the horror label?
My own work has little in depth violence, contains mainly supernatural or creature feature themes and is more along the lines of what you class as suspense. But I'm definitely a horror writer, not a suspense writer.