The weight distribution is completely different... Compared to my driver, a 2007 TM 425 with a regular shaft and standard weight settings, the JetSpeed carried the ball about 20+ yards further due to a higher launch angle. I did not have to time to change the weights on my driver to try to match the COG in the JetSpeed.
The difference was probably more than just the launch angle. What was the difference in spin? I'm guessing it was lower. Ball speed was probably higher as well. There's only so much you can reconfigure with your current driver.