My bulbus nose predates the Zipp 'eliptical aero shape' working simularly by helping the air pass over my face with less turbulance. Frankly I've half a mind to sue Zipp
I actually read about this in an article recently...
To simulate the same thing you could try DIY wind-tunnel testing. Get a friend to drive at a consistent 30mph and stick your head out of the window. Use sandpaper to modify the shape of your nose and measure aerodynamics by how hard your head is pushed back. After an hour or two of adjustment, you'll really notice the difference!
I actually read about this in an article recently...