I had a 505, but I assume they are similar. There are at least two fonts: a serif and sans-serif.
I'd try experimenting (or ask the question in the Calibre forum).
Here is what I used to use for settings when I was converting to LRF. Try clicking on the Fonts check box in Filter style information also.
You could also try embedding a font,it's in the LRF Output pane (although I've never tried it).
The regular being displayed as italics sounds like more of a formatting error then a font error.
I'm a couple of versions back on Calibre, so my screen shots may not match.
Good luck.
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