Hello Maryann,
I check in your reference site http://e63.415.myftpupload.com/cvt-services/ and your site http://interiorsalvagedesign.com where both of these site have same width of 1140px.
For padding in header, you can add the following css in “Appearance => Theme Options => Custom CSS” box.
#site-logo { padding-top: 0; }
#hgroup-wrap { padding-bottom: 0; }
The title Gallery from Jetpack is only supported with Sidebar. So, either you need to user default gallery or you can add sidebar to the gallery. If you want to change the width in Jatpack gallery then you need to change the code width in functions.php file. But for this you need to build child theme and then edit it in your child theme.
if (!isset($content_width))
$content_width = 690;
Regards,
Sakin
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