It'd be far easier if you simply copied the formatted source document to a new file, then used Format|Font|Regular on the whole of the target document before running the macro. If you need to clean up paragraph breaks in the target document, that's easily done too - by the addition of some code after the 'Loop' statement:
Code:
With Doc.Range
With .Find
.ClearFormatting
.Text = "[^13]{2,}"
.Replacement.Text = "^p"
.MatchWildcards = True
.Execute wdReplaceAll
End With
End With