Units have their own lines of sight, it's not a different distance that different ships can be seen from. You can see anything within the reveal range (the circle) around that ship, you can't make it so you have different bubbles that show different ships. If you mean you want to make every ship have larger reveal ranges, then it's Space_FOW_Reveal_Range. We've already drastically increased them for 2.0, but just because a unit can see you doesn't mean you can see it.