@AndyAitch - have you tried converting the DOCX to MOBI, I just converted a couple of my DOCX's to MOBI and viewed them with Mobipocket Reader.
My bullets, numbered lists, header & strapline formats were all good
There's a minor glitch with underlined, bold, small caps (which may be the viewer preferences), otherwise they look great - dare I say better than my ePUBS - but again that's probably a viewer preferences issue.
BR
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