UserOptions.ini Change Renderdistance to (positive number) 1000. That WILL have a noticeable effect for sure.
I was playing on 5000 but that is still to low. It is nice to see that enemy but when you take shots at him and get closer you see he is behind an object. Wasting your bullets. 10000 seems to work fine though.
Think you've added a zero too much there mate. 1000 is pretty far - We're talking further than your average tech plant hex here - not far enough for pilots to properly see far away though (use 1500 or 2000)