Sometimes it is difficult to engineer translators. In addition to preventing co-channel, adjacent and second channel interference, the signal must remain within the protected contour of the originating station.
If someone will post the actual callsigns of the translators so I can pull up their maps, I can try to make educated guesses as to what the issues are. I do not have the empirical knowledge of the geography that you are presuming in your discussion.
100.1 is W261DL . There is WNSY to the north that would limit them on the Northside
102.1 is W271CV. There are a few on channel translators and LP stations close. Also there are 2 class A's north on 102.3 in Buford and Rome.
100.9 might be limited by 101.1 Elljay
The average elevation increases the farther north you go. With the general racial make up of the market the farther they go north the better.