3950x Stutters only while recording.

[Dinez]

Hello Everybody.
I'll start by listing my specs.

Gaming-Rig
Motherboard:MSI Gaming Pro Carbon AC
CPU:Intel i9-9900ks
RAM:32 Gigs Corsair
GPU:MSI 2070 RTX

Streaming-Rig
Motherboard:MSI MPG X570 Gaming Plus
CPU:AMD 3950x
Ram:16 Gigs Corsair.
GPU:MSI 1650 Super

My OBS Settings are those.

As you can see i'm running a slow preset and it's totally fine my cpu usage is only at (3950x)40% and here comes my first question.
I can clearly see that my cpu usage is at 40%, but they are some cores which are running at 100%
Could i somehow balance it more so to put load on cores that don't have load?

Problem's
Since the 4k capture utility from elgato is total dogshit probably the worse piece of software i used.
Once i starts it uses 100% of my hdd without even having started recording. Flashback recording off.
Today i tried to record with my obs while streaming and everytime i started the recording i was getting big stutters on the stream,
while i have a 1650 super in my rig only for that purpose.

Here is a short clip of a stutter. https://clips.twitch.tv/NimbleKathishBeefWholeWheat-LrPz7BdREwweyyBM

I'm recording on a Seagate Barracude 6tb

LogFile: https://obsproject.com/logs/GKxKr9dNC5j9ctQa

 

[Dinez]

8000 is cause i'm partnered and it's fine i don't have any issues with the bitrate.
and mp4 is my personal preferences.
The HDD is not a usb one.