@blackrock36 - I find calibre converts DOCX to EPUB better than filtered HTML, no matter whether it comes from Word or Writer. Even better is the DOCX Import (Mammoth wrapper) plugin for Sigil, but you have to put in the effort to map your word processing Styles to CCS entries.
But most crucial of all is to use the word processors Styles rather than inline formatting, and to remove superfluous newlines, tabs, and unused Styles before saving.
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