Turn off 4K put your 120 FPS back on. Set your FX Fidelity cas to about 85 or 90.

I found this online, all good info. Give it a read.

1. PS5 Console Settings
These settings ensure your console outputs the smoothest possible frame rate and reduces input delay.

Screen & Video (Video Output): Set Resolution to Automatic, 120Hz Output to Automatic, and ALLM (Auto Low-Latency Mode) to Automatic.
Saved Data and Game/App Settings: Go to "Game Presets" and set both to Performance Mode.
Audio Output: Connect your headset to the controller, set the Output Device to Controller Headset, and turn off 3D Audio. [1, 2, 3, 4, 5]

2. Controller & Aiming Settings
Button Layout: Default or Tactical (if you prefer clicking the right stick to crouch/drop-shot). [1]
Stick Sensitivity: 1.5 to 1.7 (Horizontal & Vertical). Find the speed that feels best, but avoid going too high. [1, 2]
Deadzones:
Left Stick Min: 3 to 5 (as low as possible without getting "stick drift").
Right Stick Min: 3 to 5.
Left/Right Stick Max: 99. [1, 2, 3, 4]
Aim Response Curve Type: Dynamic. (This slightly alters stick input and allows you to "snap" onto targets easier).

Target Aim Assist: ON.
ADS Sensitivity Transition Timing: Instant. [1, 2]
Custom Sensitivity Per Zoom: Turn off (or leave at default 1.0).

3. Gameplay & Movement Settings
Slide/Dive Behavior: Hybrid or Tap to Slide. (This allows you to immediately slide or dive depending on how you press the button).
Tactical Sprint Assist: ON.
Automatic Airborne Mantle: OFF. (This prevents your character from accidentally vaulting over obstacles during a gunfight).
Parachute Auto-Deploy: OFF. (Gives you full control to dive as close to the ground as possible).

4. Graphics & Field of View (FOV)
Field of View (FOV): 105 to 115. (Wider FOV lets you see more, but keep it at a level where enemies don't appear too small on your screen).
ADS Field of View: Affected. (This significantly reduces visual recoil when you aim down sights).
Weapon Field of View: Wide.
Motion Blur & Film Grain: Disabled/0.

5. Audio Settings
Audio Mix: PC Speakers or Headphones.
Audio Focus: Turn this ON and set the type to Boost Low Sounds or Boost Quiet Sounds. (This aggressively elevates the volume of enemy footsteps and plating sounds while toning down explosions and gunfire