with 0.4.3 sdk if you not reach solid 75fps for VSYNC lock at 75fps, vsync lock at 37.5 or something like this. You can disable vsync for check if you fps increase, ‘hmd vsync off’
i got more than 120fps in my demo and its significant more detailed than ‘VR template’, you must re-check all performance options. Default options in UE4 are very expensive for VR.