[Vulkan Issue] Capped at 60FPS When Nvidia Reflex is Off; Severe Hitching When On

[CirqueAlvis]

The game is stable when DirectX 11 is used regardless of Reflex being enabled or not. Vulkan frame-caps the game at 60fps when Reflex is disabled and gets severe hitching and lag-spikes when Enabled or Enabled+Boost.

Notes:

• FPS and other stats can be seen at the top-most part of the video.
• This issue for me on Vulkan existed even months prior to setting a Dynamic SoC undervolt for my APU.

System Specs

• OS: Windows 10 Home 21H2
• PSU: Corsair CX550W 80+Bronze
• Board: Gigabyte A520M DS3H v2 rev 1.0
• GPU: ASUS Turbo RTX 2070 SUPER EVO (I had a GTX 1660 Ti before, but still had this same hitching problem)
• CPU: AMD Ryzen 5 5600G / Stock Cooler
• RAM: Lexar THOR 16GB 3200MHz Kit

Nvidia Control Panel Settings

• Image Scaling = Off
• Anisotropic filtering = Application-controlled
• Antialiasing - Gamma Correction = On
• Antialiasing - Mode = Application-controlled
• Antialiasing - Transparency = Off
• Background Application Max Frame Rate = 30fps
• CUDA - GPUs = All
• CUDA - Sysmem Fallback Policy = Driver Default
• Low Latency Mode = Ultra
• Max Frame Rate = 120fps
• OpenGL GDI compatibility = Prefer performance
• OpenGL rendering GPU = NVIDIA GeForce RTX 2070 SUPER
• Power management mode = Prefer maximum performance
• Preferred refresh rate = Highest available
• Texture filtering - Anisotropic sample optimization = Off
• Texture filtering - Negative LOD bias = Allow
• Texture filtering - Quality = Quality
• Texture filtering - Trilinear optimization = Off
• Threaded optimization = Auto
• Triple buffering = Off
• Vertical sync = Use the 3D application setting
• Virtual Reality pre-rendered frames = 1
• Vulkan/OpenGL present method = Auto (I've tried testing the two options: Prefer Native and Prefer layered on DXGI swapchain. None of these have fixed the issue).

Edit: Needed to remux the clips from mkv to mp4 for playback.