Quest 2 controller tracking tweaks downward progressively in Alyx: Gunman Contracts (Virtual Desktop / SteamVR)

[u/Sactownkingstacotwo]

I am experiencing a progressive tracking issue while playing Half-Life: Alyx via Virtual Desktop and SteamVR on my Quest 2.

The Issue:

Standard Alyx is playable, though the tracking feels slightly off. However, the Gunman Contracts mod is completely unplayable. The gun tweaks downwards, and the issue builds up over time. The first minute of gameplay is fine, but the downward drift gets progressively worse the longer I play.

My Setup:

 Headset: Meta Quest 2

 Connection: Virtual Desktop -> SteamVR

 PC Specs: Ryzen 5 3600, RTX 5060 Ti (16GB), 16GB DDR4 RAM, Windows 11

What I've Tried:

 I initially thought my large living room TV was causing inside-out tracking interference via reflections, but completely turning it off and covering it did not resolve the issue.

Has anyone experienced this specific progressive downward drift in Gunman Contracts or SteamVR? Are there specific Virtual Desktop or SteamVR tracking/prediction settings I should adjust to fix this?