cuvid forces your GPU into high performance mode while dxva and d3d11 use the NCP power setting which is by default optimal and which is very well known to be problematic with madVR.
no matter which hardware decoder you select on nvidia you use the same decoder in the end the only thing that changes is how this data is transferred.
so go to the NCP and change the power setting to adaptive or maximum performance and try again.
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