I have no idea what you are trying to do. If you want to somehow force the kindle to reduce its normal page margins, then there is no way to do that reliably. Setting negative page margins is a hack that will break in many situations.
As far as calibre is concerned, you can only do the following:
1) Set the various page margin options to less than zero, in which case calibre will not set any page margins at all
2) Disable removal of fake margins so that whatever fake margins you are using are left alone
And incidentally, using
* to set margins is extremely poor practice. If you have any nested tags at all every nested tag will get an additional margin.
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