I heard that you must ensure that your listing was prepared between the hours of 10am and 10.30am PST whilst standing on one foot.  The text in the listing must be more than 78 words and less than 100 words and contain no ifs buts or maybes. 

And ... if your feedback is at an uneven number when you list then I think it might be just bad luck and that listing will have no chance to rise in best match rankings.

Tongue-firmly-in-cheek ....