Capping the FPS in nvidia control panel (NCP) works for me with my Quest 2. My headset is set at 80Hz.
I usually change two values for MSFS in NCP:
- Max background frame rate = 40
- Max frame rate = 40
I usually have to add the simulator to the program list whenever I install new nvidia drivers.
Perhaps you could temporarily try using the global NCP setting instead, just to see if it actually caps your FPS. If it works, perhaps it’s a game profile issue in NCP. Otherwise, Rivatuner should do the trick.
Cheers,