I don't understand what the problem is.
Why does the GPU load only 10%?
I coding in Adobe Media Encoder 2020 (14.6)
Windows 10 x64
Intel Xeon E5-2678 v3
GeForce GTX 1060 WINDFORCE 3G
Nvidia Driver 457.30 Studio
Input video without effects (Fujifilm, 4096x2160, 24fps, MPEG-4, AVC, 4:2:0, 8bit, 200Mb/s) 01m:13s
Output video 4096x2160, 24fps, Voukoder 7, H.264 (NVIDIA NVENC) default settings.
Encoding without filters and downsampling.
The duration of the video is 1 minute 13 seconds.
Encoding time 2 minutes 26 seconds.
CPU load 20-30%
GPU load 5-15%
I tried it with and without GPU acceleration.
Tried different settings.
When encoding without a Voukoder with the usual codec H.264, the encoding time is 3 minutes 11 seconds, the load of the GPU and the processor is the same.
when encoding in After Effects and Premier, the speed is even less.