I dispute the assumption that my emotions represent my values.

Me too. There are people who consistently judge that their morality has "too little" motivational force, and there are people who perceive their morality to have "too much" motivational force. And there are people who deem themselves under-motivated by certain moral ideals and over-motivated by others. None of these would seem possible if moral beliefs simply echoed (projected) emotion. (One could, of course, object to one's past or anticipated future motivation, but not one's present; nor could the long-term averages disagree.)