DX11 Extend Desktop Mode Tearing/VSync issues

Has anyone been able to get the DK2 to run in Extend Desktop mode using DX11 without tearing/vsync issues? I've tried a bunch of different setting combinations that were recommended in other threads (vsync on/off, maxQueuedFrames, disable Aero, etc) and I still get a bit of tearing on the right eye (it almost looks like a few or one column of pixels). The application was built with Unity 4.5.3 using SDK 0.4.1. Installed latest runtime and 2.11 firmware.

As a side note, I've never gotten Direct HMD mode to work.

Here is my setup:
i7 3930K 3.2 GHz
32 GB RAM
Dual GTX 780 in SLI (Driver version 340.52)