The following is guaranteed to work:
1) In Preferences -> Output options -> MOBI output. There is a "Personal doc tag" set it to blank (delete [PDOC] or whatever is there now).
2) Do a MOBI to MOBI conversion.
3) Send the file to your Fire with send to device.
Note that if you e-mail a MOBI to Amazon for the Fire, it will always end up in the Docs app.
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