header positioning problem

It is difficult to work only with screenshots, but can you try to delete all section breaks and see if that helps? If you have only an image on a page, nothing else, the pagination will be no problem. (Make a copy of the document first to have back-up, then hit Ctrl+H, type ^b in Find and nothing in Replace, or perhaps ^p in Replace, up to you and up to the document).
Then set narrow margins in the page layout.
If that doesn't help, then the only thing I can think of right now is simply choose a bigger page size where the images would fit.
To print, if you need that, you'd probably have to scale down.
Say if it helped. L.