You write something - an email. You see issues, ways to make it better. You do so. Now it's worse because it's no longer natural. You're interrupting yourself with parentheses to clarify. You're saying more than the recipient will probably want to know or think about right now. You can't go back. It wasn't good enough. But now it's worse. And you can push forward, but it's unlikely it'll ever feel as natural as the spontaneous version. At least... ok, eventually it can, but there is no way whatsoever to tell how long that will take, and the only good way to make sure is to put it aside for a week or two and read it with fresh eyes.
This is my life. Between spontaneous and polished, there's the undefinable sea of awkwardness - and saying too much and too little at the same time.