Staying light during the rest of the game is irrelevant. All that matters is what you say to Atton at first.
My first game, I was LSF, but selected Revan as DSF... I didn't see Carth at all (seeing as Carth would have died at the end of KOTOR1).
My second game, I was DSF, but selected Revan as LSF... and Carth was all over the place, and I had that cut scene with him after the Ravager battle (I was a happy girl).
And while I have yet to play a game stating that Revan was male, I understand that it's pretty much the same, only you see stuff involving both Carth and Bastila. (I think? Correct me if I'm wrong.)