Alternate endings
rowriter:
Yep, it's perfectly acceptable to include alternate endings for a story in a submission if -- IF -- those alternate endings are necessary to the story. Think of what Tom Twyker did in Run Lola, Run. How many "endings" did that movie have? Three? I don't recall, but there was more than one, and they all worked, by golly. The story would not have functioned without them.
Okay, but that was a movie.
So: A few years ago I sold a story with no less than four witty, clever, and daring endings, each of them necessary to tell the kind of story that I wanted to tell.
As far as I can tell, the story sank without a trace in the literary sea, so maybe it wasn't as witty, clever, and daring as I thought.
But it sold. I spent the money foolishly.
As to your dilemma, yes, sometimes you can muck up a story by twiddling with it too much, and sometimes going back to an original ending is a perfectly fine idea, and sometimes a story is simply as good as it's ever going to be, even if that means not very.