Great observation! When increasing the exposure with the ofset controls (+R +G +B), the algorithm favors the red chanel in terms of total density compared to green and blue. "Red has a total density value of 37% of 1/12th of a stop or 3% of a full stop" as explained in Dan's article. Do you know if the relationship between R, G, B is unevenly distributed in terms of saturation as well? Or is red only overweighted compared to other colors than blue and green?