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You don't need any Kobo Libra settings. Under Conversion => Common options, I use Tablet as the output profile and Default profile as the input profile. Under the Conversion => Output options => EPUB output, I have preserve cover aspect ratio checked, Split files larger than set to 512KB (default is 260KB), Shrink images larger than set to none and EPUB version set to 3. In tweaks, I have the maximum_cover_size tweak set to 2500,3750.
I do shrink the images before setting them as cover images (1000x1500 or 1125x1500 whichever is closer to the original aspect ratio) but I prefer to do this once rather than having calibre pre-shrink them and then shrinking them again.
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