My Tests were done as follows...
put this in your library/ussubparts folder:
http://www.speedyshare.com/292155739.html
and extract this test mission and put it in your single missions folder
http://mpgtext.net/subshare/18Edit.zip
then run the mission and use TC for a while..
You start with 4 aircraft approaching from N, S, E, and W plus 1 small and 1 large surface contact from SE and NW respectively.
Pick a 45 porpoise (not SJ - without the campaign upgrade) and see if you spot them all.. I can..
BTW I have not entered any of my own values into the subsensors file, this isn't a tweak, I have merely combined those from 1.1 and 1.2 to get it to work.