Yea, converting a book always saves the coversion settings for that book. I don't know of any exception.
I found you can erase the conversion settings in the convert dialog by checking the "Use defaults" button then pressing cancel.
It seems that you never want to save conversion settings. I don't know how to do that, but it is easy enough to erase them all using bulk edit. It would also be easy(ish) to use action chains and a python action to reset the conversion settings for selected books.
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