As of patch 2.4.1, Natalya's RoV build is not meant for pushing GR. It's more for speed clearing T10 and low GRs. If you wanna push the GRs, you are better off with Marauder Chakram, Unhallowed Essence Multishot or LoN FoK build, with the LoN FoK build having a greatest potential for pushing GR, if you know how to play, but your gears need to be all ancient (or most).
That being said, your N6 build needs some improvement. Check out my D3planner build here for the ideal stats, skills and items.