I would suggest you trying different Unreal 3 profiles. Turn OFF DirectVR if you choose a profile with DirecVR to see if that helps against the “pumping”. If anythings fails try different profiles, preferably Unreal 3, from my profiles in the cloud. Many of them are “modified engines” so there is always a last chance of finding something suitable here. Dont bother with set AllowNvidiaStereo3d=True , thats for 3D Vision only.
Note: Some 3D Vision Fixed (at least Shader-Fixes) dlls do in fact work with VorpX, when trying a 3D Vision Fix, ignore the VorpX dll warning and try different profiles . Do only use such fixes on an experimental base with unsupported games because you will loose support for the official ones this way.