There is no simple tweaking that can be done to recover more ocean color data.
As an aside, the Kd490 product is not a measure of turbidity, it is a measure of the diffuse attenuation of light (at 490nm). It can be correlated with turbidity, but also can be completely uncorrelated. Turbidity is the result of suspended particulate matter, which will scatter light and thus increase attenuation (thus the correlation with Kd). However, waters with high colored dissolved organic matter content will also attenuate - but not scatter - the light. Waters with high CDOM are not necessarily turbid. In situ nephelometric measurements of turbidity have a detector at 90 degrees to the incident light source, and so only measure scattered light....we can't do that from space We *can* separate out absorption from scattering in the remote sensing reflectance signal using optical models (typically of the semi-empirical variety). The backscattered light can also be correlated with turbidity (and likely better than Kd).