ummm
I was doing this just the other night to people so I know its an issue.
It was being done to me so I took the time to get ontop of a hill and see what the issue was in relation to the settings.
Even with it maxed, with me ontop of a hill, I was seen by others and couldn't see them at times. I guess I'll have to snap screens of dots outside my ground detail range settings to help you see the issue.