I get lower FPS than you and I'm not too worried. I must have low standards.
The only things you can really change though are particles and textures. Particles governs explosions, debris, spray and things like that. The lower it is, the less "blowy uppy" things will look, and the less smoke you'll see. Low textures looks pretty grubby if you're picky, but I think it's fine. I only miss it when looking at other ships, which look lovely on high textures.