Rebuilding Flesh via Channel Mix

Does anyone have any experience rebuilding flesh via channel mixer and curves. While achieving mid-tones is simple, I'm having a difficult time coming up with an adjustment that creates a realistic 3/4 and shadow. Usually, it just seem dirty or not rich in color. In general, the process is to choose the nicest channel and use that one with an adjustment curve on top. I'm trying to keep adjustments layers to a minimum.

Any help appreciated,

Aaron