I’ve had better results leaving the frame rat limit in nVidia CP off, and using vSync in MSFS, capping frame rate at 50% of my monitor’s refresh rate of 165Hz. I get 80 FPS, and my GPU load dropped from 95% down to 70%, with power draw and temps lowering significantly. I could set my monitor to 120Hz, and get 60 FPS, but I’m happier at 80 FPS / 70% load than 60 FPS / 55% load.
OP, keep in mind that just because you are cruising along, that doesn’t mean your GPU isn’t working on terrain, textures, etc.