PC Stutter troubleshooting steps (PUBG)

Specs

CPU: 		AMD 5800x3D (I've also tried a another 5800x3D)
GPU: 		Gigabyte RTX 4080 Gaming OC (previously used a Gigabyte Radeon RX 6900 XT OC)
Cooler:		Arctic Freezer II 360 (Using 6 fans top mounted to my case with a push/pull configuration)
Ram:		Corsair Vengeance 32GB 3600MHz C18 (I've also tried 2 different lots of RAM at 16GB 3200MHz and at different clock speeds/timings!)
PSU:		Corsair RM1000x 1000w (Initially I had a 850w PSU that I swapped out in case the stutters were caused by any Power Limits)
MOBO:		MSI MPG X570S Carbon Max Wifi (Swapped out with MSI MAG B550 Tomahawk)
SSD			2x WD SN850 1TB M.2 with Heatsink & Samsung 870 evo 500GB SATA SSD (Tried several configurations, running both multiple and single drives)
Case:		Corsair 5000D Airflow with 13 Fans (Including CPU Cooler fans)
Monitor: 	BenQ XL2540 - 1080p 240Hz

Steps taken to try to reduce stuttering:

GPU (6900XT)
capping frames in game
RTSS frame cap
Disabled ULPS in MSI Afterburner
Both Full and Minimal AMD GPU Driver Installs - Tried 5 different drivers(Using DDU)
Used MorePowerTool to disable DS (sleep) states and raise power limit
Used MoreClockTool to set many different min-max clock range on GPU (tried clock speeds as low as 1900MHz and as high as 2750MHz with different combinations of voltages and different Power %)
Memory Fast Timing Level both on and off
Set a more aggressive fan curve
Different Radeon Settings (Anti-Lag, Vsync off of course, HDCP support, Tesselation Mode AMD Opt/Overide Off, Texture Filtering Quality Performance)
Freesync on/off

RTX 4080
set voltage curve in msi afterburner for 4080 undervolt at 935mv @ 2580MHz
tried bossting memory clock also and raising power limit
Set a more aggressive fan curve
the usual optimal nvidia control panel settings - prefer maximum performance, use highest refresh rate etc.
Even went as far to try nvidia profile inspector for further settings: force cuda P2 state off,
memory allocation policy moderate pre allocation.
Multiple drivers
Made sure to use 3 separate PCI cables for powering the GPU

Ram
DRAM Voltages ranging from 1.1v to 1.4v
Different Ram frequencies ranging from 2400MHz to 3800MHz
XMP on and off
Many different combos of manual and auto timings
Even used Ryzen ram calculator and DDR4 OC guide by integral
Upgraded Ram from 16GB to 32GB
ram in different slots, also tried both sticks on their own

CPU
PBO2 Tuner curve with different offsets ranging from 0 down to -30 (even set several different PPT, TDC and EDC limits)
Repasted CPU

Windows
disabling Control Flow Guard in Exploit Protection
disabling different Services (SysMain, AMD Crash Defender/External Events Utility, Diagsvc, Gupdate, edgeupdate)
Fresh Installed to both Windows 10 and 11 (tried many different versions! Currently using W10)
disabled all non Microsoft Services in system configuration
Ran a Malwarebytes Scan
updated C++ and DirectX
Power plans: High Performance/Ultimate/Bitsum Highest Performance
Disabled unnecessary programs from startup
Gamemode/Gamebar on and off
Disable Background Apps
Disabled Notifications
uninstalled OneDrive
Adjusted visual effects for best performance
Tried Manual/Disabled and Automatic Page File settings
Disabled Windows Transparency Effects
Disabled Hibernate
Disabled Bluetooth
Ensure GPU is running in MSI Mode
Intelligent Standby List Cleaner (ISLC)
Disabled Microsoft Store auto updates
disable Variable Refresh Rate
Removed Windows bloat programs
Turned many things on and off in device manager (AMD GPIO/PSP/Dynamiuc Audio Noise Suppression, Kernel Debug Network Adapter, Radio Device Enumeration Bus, NDIS Virtual Network Adapter Enumerator, HDMI Audio, Realtek software, unused audio devices, xbox 360 controller)
With and without Chipset Drivers
Tried to use Latency Mon and windows performance toolkit in an attempt to diagnose (I must admit these were a bit too complicated for me)
Disabled all Hardware acceleration on programs such as discord, spotify, Google Chrome
Disabled Chrome from running in background
disabled Windows Defender
stopped gamebarpresencewriter.exe (definitely helped to reduce some stutter)
Disabled Windows NDU (Network Data Usage)
DISM Scan/repair and sfc /scannow commands with temp file removal
Disabled MPO (Multi-Plane Overlay)
Samsung Magician Full Performance Mode
WD_Black SN850 dashboard - updated firmware, turned Gaming Mode On and RGB off
Tried different polling rates on mouse/keyboard.
Disabled HAGS
Disabled discord overlay


Other
Dismantled PC and Rebuilt it many times, even reconnecting only essential things to fault find
replaced cmos battery
Used a GPU support stand to prevent sagging on the right side away from the mounting position.

PUBG Game settings
I prefer maximum performance in-game so always play on lowest settings (have tried higher settings in case it was a utilisation issue, but to no avail).
Also turned off all of the crap - vsync, show inventory character render etc.
render scale 100%
DX11E (have also tried DX11 & DX12)

Bios settings:
Different BIOS versions
CPPC
CPPC preferred Cores
SMT Control (helped to reduce stutter)
Global C State Control
PSS support
Gear Down Mode
Power Down Mode
Resizable Bar (Smart Access Memory - SAM) both on and off
PSU idle Control Typical Current
Secure Boot
Different voltages SOC/VDDP/VDDG CCD & IOD
Dram Latency Enhance on/off/msi setting
svm mode
nx mode
Performance Regulator
Spread Spectrum
fTPM
Lclk DPM
Changed PCIe detection from auto to Gen4