Personal tag vs Cover

Hello



I use Calibre to convert mobi books into non personal book by removing the personal doc tag, and i send them to my kindle through mail so i they can have a cover..

Here's the thing
If i add a book to my kindle by sending it to my kindle email, i'll get the cover, but the book will be tagged as personal (Even though i removed the PDOC tag in calibre)

If i add a book to my kindle through the usb, I will not get the cover, but the book will not have a personal tag

How can i get both the cover and non-tagged book?

Thank you very much