The Plan B column helps prevent wallowing because there's no reason to wallow. Reread the story with a critical eye, see if it needs revision, revise it, then send it out again.
I say 'critical eye' like that's easy. The distance imposed by time helps. If I knew right away what was wrong with my stories I wouldn't be spending all this time trying to learn.
Speaking of learning, I signed up to attend the Pacific Northwest Writers Association Conference in August. If you'll be there too, let me know.