I am fairly new to WordPress, so please be patient with me. I am working with a child theme of Twenty Thirteen and am trying to make the header image 1600 px x 288 px rather than the standard 1600 px x 230 px. I've followed a good deal of the advice in this thread (changed the css and the custom-header.php, adding the header as a bg img instead of through the header menu item etc) but nothing seems to work. Posting my CSS, header.php and custom-header.php here for reference . Please let me know if there are other things I can post for reference. Basically, I just want the header to display a taller image.
[Excessive code removed - please use a pastebin to post that much code per the forum guidelines]