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Here are a couple of suggestions:
Listening to your system isn't a very reliable way of understanding what's going on. Open up Task Manager, click on the Performance tab and scroll down to your GPU. Even when your CPU is running at 100%, your system may also be using your GPU almost as hard, like this:
I'm sure you know this, but I didn't see it in your description. Unless you have these choices checked at the bottom of the Produce window, PD won't use your GPU at all:
Also, if you have the "latest version" of nVidia's drivers (v416.xx) but you don't have the beta 2224 patch installed, PD can't access your GPU at all! So either install the patch or go back to the 411.70 drivers. There's a whole thread on just this issue!
As for the stuttering you've seen in your produced vids, I'd actually argue that's more likely to be caused by the GPU rather than be solved by using it. You can easily test that by unchecking the "Fast video ..." option and producing again.
That's not the GPU, that's just the ASIC on the GPU. "Video Encode" is nothing but the NVENC chip on the GPU board. You can remove your GPU, and if you have QSV, you will see the same thing with an Intel iGPU, and your Encode Speeds will barely change.
The Actual GPU (the Graphics Processor, CUDA/Compute) isn't really accelerating anything. IN fact, your PC is barely passing any work to the GPU. This is why it's using almost no VRAM and "Copy" (which is how work is handed from CPU <-> GPU is stupendously low, with almost no spikes.
Your machine is still doing almost all of the rendering on the CPU. It's only doing the DECODING and ENCODING using a dedicated ASIC on the GPU - not the actual GPU itself. I know, it's kinda sort of confusing to wrap your head around, sometimes. NVDEC/NVENC is NOT the "GPU," it's a seperate chip that is distributed with the GPU - it does the same thing as Intel QSV, which you can have without even having a dedicated GPU in your system. The benefits of a GPU are far greater than NVENC for video editing, provided the software is equipped to utilize it. The fact that you're barely using any VRAM is a good indicator of how little work the applicaiton is passing to the GPU. It's only doing generic "GPU stuff," frankly. The 84% is nothing more than the usage on the NVENC chip on your GPU board... Windows Task Manager is useless for these things. Use GPU-Z.
Install an NLE like Premiere Pro or DaVinci Resolve on your PC and look at how much actual work the GPU is doing, and how much VRAM, Copy, and Compute gets used for the same footage using equivalent effects in those software packages. This will be evident even in Windows Task Manager, but even moreso in GPU-Z (for example).