I must say that it is very hard to work with this header.
Here is the best I could do:
Here is the edited .psd file I created. It is easy to work with and has the curve on the left of the logo and has the black at the top (took me a while, but I finally did it). I am still trying to find some nice cloud brushes.
Code:
http://www.mediafire.com/file/jmjz0lexkke/logo-EDITED.psd
Enjoy the edited PSD. It seems that the maker wanted to make it difficult for us to edit the logo.