Any way for me to improve 4K Render performance?

Hello everyone, I have been using Davinci Resolve for about a year or more now and I have been using it to render out 4K gameplay videos for my YouTube channel. I wanted to know if there was any room to improve my 4K render speeds based on my system configuration. Most of the time it is between 18-25FPS once the gameplay has started. My intro and outro are almost static and render at about 36FPS.

System Specifications
CPU: Ryzen 7 1700
GPU: Vega 56 Nano
RAM: 16GB (2x8GB) 3000MHz
SSD: Samsung 850 EVO 128GB. Resolve is installed to this drive
SSD: WD Blue 1TB. I use to record and render to this drive but there was no performance gains and I did not want to significantly effect the drive life with the massive amount of data that would be read/written to it.
HDD: WD Green 1TB. I record and render videos here.
OS: Windows 10 Home
Version of Resolve: 15b46.

None of my components are close to max usage while rendering. The CPU hovers around 60-70% according to task manager. I use the YouTube 4K preset with quicktime format and H.264 codec. But I limit the bitrate to 68,000mbps since that is the max recommended by YouTube for 4K60. Are there any recommendations to help with render speed? Maybe a different Fromat/Codec combo? I have tried MP4 as recommended by YouTube but that actually kills processing speeds when the video is done uploading and makes no difference in rendering speed. Are video game videos simply much harder to render due to the fact that the "camera" is always moving? I've noticed if the scene stays mostly similar for a long time the PC can render a little quicker.

I have seen a lot of people on the forum always recommend a SSD for editing in timeline with 4K videos, which is fair enough, but I record in 1080p (usually) and upscale the videos to 4K and I noticed no difference when rendering out to an SSD over a HDD. I do not know if throwing more CPU cores at the issue would help since I have 16 Threads as it is and they are not all maxed out. I have overclocked the CPU which had no perceivable gains except in power consumption lol. I previously used a GTX 980 and CUDA but even switching to OpenGL with my Vega 56 the times are the same. I have also given resolve access to as much RAM as it will take which is now 12GB.

H.264 exports are slow. I recommend you export to DNxHR (should be blazing fast) and upload that, as YT will transcode what you upload anyway.

H.264 exports are slow. I recommend you export to DNxHR (should be blazing fast) and upload that, as YT will transcode what you upload anyway.

Which version of DNxHR? HQ, HQX, 444?

EDIT: Actually I remember trying that before. The issue with that is file sizes balloon which would drastically increase upload times for me.

70% of CPU is actually quite high and good CPU usage on multithreaded systems.
Transcode your DNxHR master with Handbrake, ffmpeg, etc using x264, so you can get optimal size/quality.

Please use search- this "problem" has been discussed countless times. Don't follow youtube recommendations regarding bitrates- they are not very good at all.

70% of CPU is actually quite high and good CPU usage on multithreaded systems.
Transcode your DNxHR master with Handbrake, ffmpeg, etc using x264, so you can get optimal size/quality.

Please use search- this "problem" has been discussed countless times. Don't follow youtube recommendations regarding bitrates- they are not very good at all.

Okay I will give it a try.