I'm getting a pretty smooth ride on a rather mediocre system with these settings (maybe give it another try):
Vsync off, Tripple Buffer off, Unlimited Frames (Nvidia-Driver is Set to "Adaptive" VSync)
P3D.exe set balanced over all (four) cores in my case
Outside View: Set "Locked Spot" after loading the Aircraft (!)
No special tweaks in P3D Config (Affinity Mask is 14, after EXE start, i'm overriding to "All Cores" in Task-Manager)
Cheers, John