Hey did you happen to Catch last nights episode of the "Mythbusters". It was about aerodynamics and creating less drag on a car with the addition of dimples. (IE. Like a Golfball) they were able to prove a 12% gain in gas mileage just by adding dimples across the entire car. They were using the science of a dimpled golfball will fly farther than a non-dimpeled using the same amount of thrust. (which is about 40%)
After reading through your thread last night I watched the epsidoe and thought that I would pass this info along. As I thought this might help you out with your goal. Wind is going to contribute in a huge way and every little bit would count when trying to break a new record. You should check it out. It may just give you that little bit extra of an edge over the comp. if you were to design the body correctly. Anyhow Good Luck.