Hello
Well i´m no expert, but your system specs look allright to me, you got a fast enough system.
your Grafic card should be faster than my ... i got the AMD RX 480 and i have higer settings with more average frames...
hmmm. so what i would do ist too put the anisotropic filterin down to 8x
and the cockpit display to 512
also i would go down with the grass to about 500
put vsync of and give it a try
but to be honest i don´t get it i should run smooth