i've found re-directing the wind coming up nr the tank has made the whole bike to ride as clean as anything. you could even experiment by reshaping this piece of plastic only �3-00 for a piece 1.5mt long !!
http://www.flickr.com/photos/39788003@N06/3654492369/
nb also use the higher screen available from powerbronze but going for a spin with the std one to see if no longer needed