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Creator software refers to the software used to create the MOBI. As does bkp in EPUB files.
When you "tweak" by which I assume you mean edit? AS far as I recall editing does not touch the bkp field, that is set to calibre if the EPUB is created by calibre ina conversion.
As for publication date being reset on conversion, I cannot reproduce that.
When converting MOBIs a randomnly generated ASIN (uuid) is inserted. The reasons for this I have explained many times before -- a bit of googling should find you the answer.
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