O+ here too with almost similar rig setup. Correct on blurry and pixelated image of object outside the cockpit post 2.5.6. This is with or without the shaders mod. Same rig used to do quite well visually in far distance in 2.5.5
What does help for me is setting dcs PD to like 1.2-1.3 and steamvr SS to 120%. Image a sharper and fps is in mid 30s.
A hardware upgrade is in line for me too, just waiting for the dust to settle with all the new line of cpu/gpu introduction.