I am running an NVIDIA GeForce GTX 980.
At first I thought the jitteryness/tearing was due to poor framerate, but I was able to get my framerate to cap out at 90 after arranging my monitors as detailed here.
I also tried to eliminate the tearing by going into my NVIDIA Control Panel and turn VSync to On.
Are there any other steps I could try? Or is this an issue when using UE4 with the Vive? (I have seen this happen on several other projects)