I finally finished the light missions on the T28 campaign. It was insanely hard. I did it on the map (Fiery Salient) and in the exact manner I predicted. I went to the bushes at E1 and sat there the whole match. I did 8,800+ scouting damage. That might have been the most I ever did in any match. Here is a link to the replay if you want to watch. I don't know any other way to complete this mission.
I did it again in the same map (the other side this time). This time I did it in a tier 5 ELC AMX. I did 6600+ spotting damage in a tier 8 battle. I did it the same way spotting from E1. Here is the replay.