I think I agree with Azj, if a story isn,t working, try something new. Why hack away at something you know is no good? you can cry "experience" all you want, till the cows come home. But no matter how much you experience "crap", you don't get experience on doing things right. for example I am writing a novel, and got all the way to the first big plot point, and then realized that my writing sucked. certain scenes/chapters were good. but as a whole it was sliding into awful. so, I scrapped it and started over. by analyzing what sucked, I realized what to do. after a stressful group of months I dragged my story onto its feet and now its running, with only a stumble or two on the way.
basically its like this, I agree you can't learn to ride a bike without falling down, A LOT, but its no use to keep pedeling once you hit the ground. same with writing. once you suck, stop, pick it up, and figure out what you did wrong.
by the way I do not suggest wearing a helmet while writing, while riding I maintain helmet use to be a good idea.