If the only thing holding up your application is your personal statement, wrap that up and be done. Today. I'm not trying to totally belittle the importance of the statement, but if your letters, scores, and transcripts are already in, you need to have been done with that...yesterday. If it's not amazing by now, it's not going to be amazing by working and re-working it. Grammar check it and submit. The effects of holding up your application outweigh the effects of polishing up your statement at this point.