I've actually figured out a decent way to get consistent skin tones, but it requires a x-rite colour passport and Davinci resolve. I have two work flows depending on the result I want, Option one: Using a custom LUT made by myself. https://vimeo.com/108150808, Use a custom WB with the greycard, then record a couple of seconds of the colour checker for reference. Shooting in S-LOG 2 / S- GAMUT +23 saturation, then using colour matcher with these settings ( Source Gamma: Slog-2 / Target Gamma: BMD Film / Colour Space: P3 D60) (This gives me a nice teal/orange look) Then applying the LUT and fiddling to your desire. Option Two: Use a custom WB with the greycard, then record a couple of seconds of the colour checker for reference. Shooting in S-LOG 2 / PRO Colour +23 saturation, then using colour matcher with these settings ( Source Gamma: Slog-2 / Target Gamma: BMD Film / Colour Space: P3 DCI) (I find this gives me a very neutral almost film/canon representation of the colours). Just requires the contrast/saturation to be tweaked. I may be wrong here as I've only tested this a small amount, but as long as you set your custom WB, you may only need to do the colour checker once. As In you could create a set of LUTs with the WB pre-dialed in to a temperature and should get consistent results as long as a custom WB is set.