Depth of field it's an artificial effect needed on 2D monitors to give the feeling of.. Well, depth of field, by blurring far away or out of focus objects. In 3D and VR is useless, your eyes will naturally create the effect. Ditch it.
This - I turn Depth of Field off as it doesn't really help in VR. It'll give a little more power back for HMDQuality.
Ambient Occlusion is also ok on Low... this uses quite a lot of GPU power too.
SRV - give me the full effect
Personally I'm amazed the SRV doesn't have a small sick bag somewhere in the cockpit - this would have been a good easter egg! (then again, you'd have to pop your helmet to use it, perhaps not a great idea!)