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Your mobi file is probably "joint mobi", containing both KF8 & old MOBI format? If it was generated with KindleGen v2.x/Kindle Previewer, then it is combo for sure. So if you want to remove personal doc tag you must first split the file to "old mobi" and KF8/azw3 parts using KindleUnpack plugin for Calibre.
Changing those 3 EXTH values only "works" (as in Kindle treats it as book) for non-dual books.
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