Possible to modify/manual update the UE4 Rift plugin?

Development Platform & Builds XR Development
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Hello,

I’ve recently done something to screw up my UE4 Rift interface. Previously I was getting butter smooth 90 fps in the Rift with the default ue4.12 scene. Now I’m getting around 22 fps but if I open up the same default scene in 4.10 I get a smooth 75 fps. Is there anyway to manually update/ modify the UE4 Rift Plugin? Any other ideas welcome!

So far I’ve:
Uninstalled Epic/Unreal and all engines 4.10/4.11/4.12
Clean uninstalled and reinstalled Oculus Rift
Reinstalled UE4.10 and 4.12 and seeing the same behavior

thanks for any help!