What's the best way to color correct a skylight? When I dig into it and add a cop cc node after the sky_env_map the correction doesn't wrap properly and creates a longitudinal gradient of effect, not sure what I need to do to make this work.

In the color correct COP, set the Plane scope to “*” to get all the skymap cube planes to be affected. By default, only C is, and you'll need to correct Left, Right, Top, etc. as well.