If you go back to any of your much older stories here and make edits, please check to see if your paragraph spacing remains. If not you may have to manually space and you'll see double-spacing between paragraphs. We'd prefer you take care of it if at all possible. However, if you can't get that to just one space, leave the double space and write a note in the Note to Moderators box. We can fix that.
I put out this question on another thread before I found this one, which is more pertinent:
How do you edit a published story? I found several typos that both I and the mod overlooked, and I'd like to clean it up if I can.
I would never change anything of major import in a published story. If I came up with a better, more clever phrase, I'll just use it somewhere else.
Stories are like children: you nurture them and raise them. Publishing is akin to them graduating college or getting married - starting their lives on their own. Whatever you have done to shape them is by and large in the past, and they are their own people now.