I personally have a lot of difficultly seeing the difference with split screen comparisons, I prefer seeing the whole screencap with the new colour grading in order to be able to get a better idea of how it looks. Could you put up some comparisons of the whole screencap rather than the halfway split, preferably using http://screenshotcomparison.com so the difference is even easier to see?

Also a video clip with the regraded colours would be incredibly useful in being able to give you my thoughts on the colour/image dynamics of your regrade.