When you talk line spacing, do you mean the spacing between the actual lines of the paragraphs or the space between paragraphs?
If it's the space between paragraphs, that's margins that are set that way. It's the top and bottom margins that cause the space between paragraphs. Also, if you don't like the margins on the left/right, that's cause by the left/right margins. Sometimes an @page is the problem. So set the margins in body and set the margins in @page for your PRS+ CSS.
You may not need to convert at all this way. And Sigil would be a lot easier to look at the code/CSS and see what's going on so you can make your CSS to cover most cases.
Converting with Calibre can cause this CSS not to work as it changes things. Going ePub > ePub is not good and going ePub > mobi > ePub is very bad as it changes everything in the CSS.
I'll put together some CSS code that might work for you. It won't contain anything to do with the fonts, but you can add that yourself.
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