Dependent on your CPU, it may be that it simply is running at max capacity even with all the right settings. You can compare your configuration against https://www.wowza.com/docs/wowza-transcoder-performance-benchmark.
There are 3 places where you can decide to use CPU or GPU:
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Decoding (in the template XML under Root/Decode/Video/Implementation)
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Each encoding profile (Root/Encodes/Encode/Video/Implementation)
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Scaling (Root/Scale/Implementation)
Also, make sure the K5000 supports the codec that you want to de-/encode (see https://developer.nvidia.com/video-encode-decode-gpu-support-matrix)