I can't tell anybody what to use, but the Realistic Skycolors by Abdullah Almuntassir is in the package and probably some HD 2 clouds for detail. It's the color of the clouds that the package is focused on. And the clouds blend together much better also. But YOU MOST USE THE DEFAULT shader, there is no need to use a hacked shader file. Now I've got a cloud bank I most go fly through so Have Fun..and enjoy.
TomCat357