Why does my Zotac RTX 5060 Ti stutter in Metro Exodus tunnels?

I was losing the plot in the Moscow subway; the lighting flickers caused microsecond latency that broke my immersion. I tried dropping the graphics settings, but the stutter persisted because the GPU hit its power wall. I used GamePP Power Plan Switcher to push the power limit from 100% to 110%. RTSS confirmed the frame time stabilized from 15-22ms to 10-12ms. AIDA64 showed the core frequency holding steady above 2500MHz. It finally feels smooth, so I can save my progress without fear.