The best results for my config are coming with the below settings
AGL 0..10.000 Ft 0.01... 0.33 FFTF (Locked frames 120)
But I get very high frames rate at low density areas. So, I am planning to implement profiles for areas defined by the user.
The best result can come in cooperation of FFTF auto change and auto frames rider. Unfurtunatelly, I still did not found any way to manage the frames. I can change them but something blocks me inside p3d code to apply them. Still trying to figure it out.