Editing text in a PDF is always a 'dangerous' endeavor. Although Adobe has built-in text editing tools and capabilities, the very nature of a PDF, and the various ways a PDF is created make text editing success a variable, not a certainty. All PDFs are different, and two that look identical may in fact be constructed entirely differently under the skin, and their editability will vary. It may not be possible in your situation and workflow, but it's always preferable to make edits in the source documents, not the PDF - but I know this isn't always possible. Not a solution for you, but a reality in some cases with PDF technology.
My best,
Dave
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