Mail Merge Does not retain margins and tabs

Has anyone had this problem or am I doing something wrong?

I create a mail merge template with margins, fonts and tabs unique to the document
When I go to contacts and perform the mail merge the resulting initial view of the document is fine.
However when I go to preview or print or edit the merged document all the fonts, margins and tabs revert back to a system default. So I have to fix the margins etc.
I cannot seem to find this system default definition in order to change it even though that would just be a hack. I have check-marked the boxes that appear regarding make the page format a default. But that has not helped.

Thanks in advance
Dan