The difference between the first and last page of last year's booklet was 6mm (about 0.23 inch). So that is quite noticeble. This year we have a vintage border on the spreads.
I did shift the content and frame on each page manually. I calculated the shift and set the increment of the cursor keys. Next I dectached all master page elements except the locked background. Then on the first round I shifted the frame inside its frame and on teh second run the contect to balance the border distance. I pressed once on teh arrow key on the second page, twice on the next, and so on.
It is stupid work and should be possible by a setting, but at least the result looks good.