Line spacing within a paragraph is the line-height parameter. You have 1.2 which is a normal value, nothing exceptional. Spacing between paragraphs is determined by margin-top and margin-bottom. As you state that all lines are a paragraph, these would probably cause the extra spacing. Only the calibre2, 3 and 5 have additional margin-top.
You should start with removing the additional paragraph breaks and see if that solves the problem. It could be that there are also empty paragraphs (lines) between the text lines. There have been some discussions in this forum about how to remove the spurious </p>'s with regexp replace.
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