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Luke,
Your 2007 body had a engine cowling...can you reuse it, or make a similar?
I would also suggest making the front wing wider if it is allowed in the rules, to put the front wheels in the wind shadow of the wing. Also, some fender flares in the back to smooth the flow around the rear wheels. You'll have to check the rules there for "open wheel". Solid Moon disks instead of mag wheels also might help a bit.
Since you are concerned about the look as well as drag, starting at the back instead of the front might be a better approach. Is your rear wing actually doing you any good? You might be able to get rid of it altogether and get the same effect by moving the engine a few cm forward on the chassis.
We would need to see some pictures of the rear-end. If the air stream is creating a vortex "trailer" you are pulling down the track, putting a boattail with a sharp edge on it could help to reduce the size, or allow for better separation of the flow off the rear.
I think the other guys are requesting dynamic data to try and understand where in the run the aero loads are hurting you. For example, static wind tunnel testing might suggest increasing the angle of the front wing. But if you do this, it won't hurt your performance at the start, but once the front wheels come down, it might put your blower in the wind shadow, and rob your horsepower in the last half of the run.
Darren
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