If you're going to use code like that, it should be run before you make any of the other changes - and only on portions of the document preceding an unbalanced page/column ending. That's because the paragraph with a short line-wrap at the end that you can manipulate to achieve the desired result might occur, say, three or four pages before the unbalanced one. In your screenshot, for example, the unbalance is apparently due to the use of Word's widow/orphan control, but there isn't a paragraph with a short line ending on the 'short' page. There may be one on the previous page, however, and adjusting that one would shift everything up by one line on the two pages in your screenshot.

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Cheers,
Paul Edstein
[Fmr MS MVP - Word]