Something that will help is to get rid of the big sun visor on your helmet and add a full face shield. Lots of drag catching the wind in your open face hole and under the visor.
For more inspiration, Google Barrett Jackson gravity racers. In 2007 Barrett Jackson auctioned sixteen or seventeen gravity racers made by Aston Martin, Bentley, BMW, General Motors, Nissan, Chrysler, Volkswagen, Audi, Mazda, Porsche and Pininfarina and others. (I searched for a full gallery but every article I found had at most one picture of one of them.)
This may be one of them.
http://twwhlspls.com/wp-content/uplo...gravity_04.jpg I wonder if stiletto heels on the driver would be more aerodynamic?