Actually, this is less about editing and more about submissions. The tip? Be honest. In your query letter, if your book is a re-release, if you’ve retitled it, if you’ve previously submitted it to the company before. Be honest. It makes us cranky when we find these things out on our own. And then we remember you for all the wrong reasons and you go on our list. The list is bad. You don’t want to be on the list 😉
And while we’re talking about submissions: polish, polish, polish. I’m seeing a lot of rejection letters that mention grammatical errors here recently. That’s unacceptable, really. Find a critique partner, a beta reader, read your book out loud but for pity’s sake, polish!