I edited my Soldier View Distance aswell, but only very slightly.
First thing i did was remove the Sight Penalty of the Armors. It would be just logical that new Armor comes with better Optics, especially Hightech Alientech-Based Futuristic Armors.
I also gave the Combat Vehicles higher Visibility Range than the Soldiers and a higher Sight Angle. Same Reason as Soldier Armors. It is a Tank with top of the Line Electronics that has much better Visibility Range as the Human Eye with Infrared, Radar, etc.