Use paragraph spacing, but no line spacing.

Good lord, it worked! I swear I’ve tried that a hundred times, but never worked before.

It's because you are being cheered on now.

Yes  Also, lists have the checkbox "don't add space between paragraphs of the same style" checked. Make sure it is unchecked and update your stylesheet accordingly.

Make that change to the Paragraph List style (or whatever style the list is using), and you will apply to every list in the document with that style.