Recto verso problems when deleting a page.

Hi all,

I'm designing a book where the inner page margin is different to that of the outside margin. I have set up numerous master pages reflecting this (each chapter has the chapter title as a running head). The author has deleted text from one page meaning that a chapter now finishes a page too early. To get the content to match up with the master page styles I need to delete one page from the document. However, instead of applying the appropriate verso page master, InDesign is still retaining the recto master page's margins although it updates the content. So a verso page now has the margins set up for a recto page. Other than manually applying all the master page items to the pages again, is there any way of getting InDesign to do the right thing from the beginning?

I'm using CS6 on a PC.

Before text alterations:

After text changes:

With verso page deleted:

All the pages following are the same, the margins are wrong and the master page items are in the wrong place (although the right items are applied to the right pages)

Any ideas?