I have noticed this with quite a few different datasets that I have worked with. The VV polarization overall has a much stronger return signal than the VH polarization. For example, in the current dataset that I have been working with, the VH polarized signal ranges between 6.09E-4 and 5.83 (intensity units), while the VV polarization ranges between 2.713E-3 and 129.86 (intensity units). This makes creating RGB composites difficult, as the RGB channels that are defined by the VV band greatly overpower the bands that do not depend on it.
Is there a reason for this, and is there a way to correct it other than adjusting the color channel sliders?