Fine tuning advice please - 9800X3D + X870E Carbon WiFi Win11

[CPS_Bomber]

Hi all,

So after years of buying off the shelf PC's and then going through numerous upgrades over the years, I've just attempted my first PC build.
It's been quite a learning curve. Nothing has exploded yet, and the house hasn't gone up in flames, and my other half hasn't seen the bill for the total spent, so I'm considering this first stage a success 

I'll list the specs in a bit.
DCS has been installed fresh, onto a fresh install of Win11, on a new SSD. I'm primarily using VR (Quest 2) via link cable for DCS.
On a monitor, I can run DCS maxed out on the gfx no issues. I fully expect to dial back somewhat on the settings for VR, but I'm in need of advice for fine tuning the bios and o/s.

I seem to be at a point where I'm falling one side of the fence or the other in nailing that sweet spot for DCS in VR with the new rig, and I'm happy to acknowledge that it's most likely down to my inexperience with bios tweaking and setting up Window from scratch that (among other things) may well be the root cause of my issues! 
I've read through multiple forum posts, Reddits and Google searches, accompanied by many tutorials on YouTube and I'm hitting a brick wall now really, so wondering if I'm missing something, misinterpreted an instruction somewhere, have got some conflicting configuration options, or whatever.... 

The main issue is I can get smooth and steady FPS (according to the counter within DCS) in both pancake and VR, cockpit crisp and smooth but the outside world looks like it has a shudder/bump every so often - like it skips a beat if that makes sense, but no FPS drop being registered on the counter. I've tried altering gfx levels up and down, and even when lowered this effect is still present no matter if using MSAA, DLSS or even the DCS presets of low/medium/high/VR etc.
On the other side, altering refresh rate and/or ASW modes on the headset using OTT or ODT result on either severe ghosting on (for example) aircraft or physical objects as they move past you with smooth terrain motion, or crisp objects passing by but the terrain looks like it's vibrating as you manoeuvre (but goes crisp and clear when not rolling/pulling G).

FYI, DCS is standalone (cleaned and full repair completed after install), not Steam.
Using VIACOM/VoiceAttack

So I humbly ask for your guidance and thoughts on the following:

In the bios (CMOS cleared and started from default settings) -
I have EXPO on for the RAM
Integrated AMD graphics disabled
USB Legacy support disabled
Resizable Bar enabled
X3D game mode on or off?
SMT on or off?
PBO on or off? If on, any specific setting such as auto, advanced, enhanced etc?

In Windows / other software (all using latest versions and updates as far as I'm aware):
Would you say the following are essential, nice to have or should I just uninstall?

MSI Center and AMD Adrenalin are installed
iCUE software installed
XBox App installed
NVIDIA App installed

Process Lasso - worth using for the 9800X3D?

I also have:
DCS - installed on same NVMe as Win11 (C drive)
Page file - set as 64GB on C drive
Power plan - set as Balanced
Game Bar - on (power optimised) with DCS set as "remember as a game"
Hardware Accelerated GPU - on
OpenXR Toolkit - installed on C drive (currently disabled)
VIACOM/VoiceAttack - installed on C drive
OpenComposite switcher - installed on C drive
OTT - installed on C drive (tried as an alternative to ODT)

Meta Software - tried using 72, 80, 90 and 120Hz refresh with various resolution multipliers

ODT / OTT - tried various bitrate values... would you recommend any specific values/settings for the various bitrates (also dynamic bitrate enabled/disabled) or just leave at default values?

Headset is connected via Link cable to the front USB-C port as it gives a test rating of 3.0Gbps in Meta software. The rear panel ports (labelled as 40G) test out as 1.9Gbps.

NVIDIA Control Panel - what would your recommendations be for essential settings and others related to latency, vsync, pre-rendered frames etc?

My specs:

Windows 11
MPG X870E Carbon Wifi with AMD 9800X3D 8-core @4.7GHz
Corsair Vengeance 64GB 6000MHz DDR5
Corsair MP700 PRO 2TB M.2 PCIe 5 NVMe 2.0 SSD x3
NVIDIA GeForce RTX 3090 Ti 24GB Founders Edition
Corsair iCUE H150i ELITE LCD XT AIO Cooler (x3 360mm Fan)
Corsair 7000X RGB Full Tower (x4 140mm Fan)
Corsair HX1000i PSU
Quest 2 VR via link cable (USB-C speed test in Meta software reports 3.0Gbps)
All HOTAS and controller peripherals connected via powered USB3.0 hubs
Internet connection is via ethernet cable

 

Sorry it's a lot to post in one go, but I figured the more info provided earlier, the better the chances nailing the settings.

Thank you for any info and guidance you may be able to provide 

EDIT - forget to ask about NVIDIA control panel (added)

Edited February 20 by CPS_Bomber

[Lange_666]

27 minutes ago, CPS_Bomber said:

MSI Center and AMD Adrenalin are installed

MSI Center comes with the Mobo I guess. In general that's just lots of bloatware.

Andrenalin is for AMD Graphics cards, since you have an nVidia 3090Ti, no need for this.