XHIBIT,
I'm setting up a site for some one and disabled all the header banners so we could have an image header only. I had a similar problem with the image being pushed to the left, even using align center. The template I was working from was Helter's Dark theme. I finally was able to get the image to center by disabling the following line, which, when I did a view source chart from within FF, noticed that you still have the same code.
Search for this in your overall header template
<td>
And comment it out
<!-- <td> </td> -->
See if that gets rid of the right side gap. Worked for me. You may have to do the clear cache/cookie thing.
I like to leave all the original code intact in case I need to refer to it.
Helter, Dark theme is great. Thanks for it and the support you give. <img>
Too many projects, too little time.