I don't know much about NVENC, but I know that for quality with H.265, you should be sure to set "Depth" to 10-Bit (and Profile "Main 10", I think), because most GPU:s can decode H.265-video at 10-bit.
16 B-Frames and 6 "Ref frames" should be set too (maybe only 5 "Ref frames" for 4K resolution or higher, to keep GPU-decoding compatibility).
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