I could be wrong, but I'm not sure that reconverting an epub will remove line-height attributes which are already in the epub. The Calibre Look&Feel page could be used to change the value assigned to line-height but not to remove it altogether.
The guaranteed way to make sure your on-device CSS line-height is used is to use Tweak-epub to edit the css file and physically remove the line-height parts. Tedious but simple.
Edit: Oh and make sure that your Calibre conversion settings are such that line-heights are not added to epubs which didn't have them in the first place.
Last edited by jackie_w; 06-23-2011 at 02:04 PM.
Reason: afterthought
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