Realism settings

[Imp]

Most people play with them all at default but & relating to your other thread & Suhiirs comment. You can adjust.
To simulate bad weather night etc apart from lowering vision range sometimes reduce spotting ability & on odd occasions to hit chance.
Reduced spotting tends to effect seeing infantry more than vehicles in my opinion so I do not see how it will help you. As Suhiir said if anything spotting might be to easy but the general concencess is default settings are about right.
Speculating here but sounds to me like you are trying to go way to fast if you keep driving vehicles into RPG range. Reduced spotting means you have even less chance to see them. Try diffrent things & perhaps thinking of what they are doing in real terms will help.
That APC with limited vision slits is driving up to a woods at 30mph are they going to see people in it? Are the people in the woods going to see the APC?

I did a post ages ago try searching tactical hints or tactical tips some of it may help