Look into liquid layout rules.
I'm there right now, will report back as my original .indd is 384 pages with some text and images on each page.
Good luck with that. Until liquid layout rules can be added to object
styles, this is going to be a lot of work.
You hit that right on the head, so I'm going to look into doing the following:
there are 10 masters with header and footer info.
I just re set the text for those
now I will center the image on each page of one chapter and see how this looks.
Click on the page tool then hover over your text box/object center, the following statement will be shown "The object width is locked. Click to change the object width as the page changes width" and a similar statement will display on the object height. Hover on the box/object edge, the following statement will be shown "Space is flexible between object and page edge. Click to pin the object relative to page edge" (those are the 2 options responsible for displaying your objects correctly). Then from the page panel drop down menu choose create alternate layout and under options choose "Object-based" in the liquid page rule drop down menu. Remember to create the alternate layout after setting your objects for changes to take effect.