I figured it out.

The header is followed by two LF characters instead of CRLF. That is why my ReplaceAll function wasn't working.

The end of the string has a single LF, not a CRLF.

I don't believe any easier than code looking for and replacing CRLF after the XML intro at at the end.

I had case where an external receiver app expected different XML than DW engine created - even with predefined XML mappings. I added post-process step where NVO would search+replace certain XML patterns. Like representing NULL values in certain cases or representing a sub collection (like XML from nested DW) when that collection was empty.

Your get-rid-of-excess-CRLF sounds like additional patterns to look for.

HTH /Michael