I'm not seeing a problem using calibre 0.8.48 on Windows. Typical of calibre conversions, the widths are narrower that spec'd with 33% yielding something more like 16-20% and with wider vertical spacing (all below the HR on Kindle 3 and evenly distributed on Kindle Fire).
When I convert using KindleGen via Kindle Previewer widths are closer to the percentage spec'd and there is no extra vertical spacing.
I no case, though, am I finding the HRs omitted. I tested with the inline Style you list and with a <STYLE> in the <HEAD> section and both worked.
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