I have the 2.4. My biggest problem is trying to accelerate in freeway traffic, pressing the pedal down and then waiting 2 seconds for the transmission to actually downshift and get me accelerating.
I suggest trying the GOPedal first to see if it does what you want it to do, which is decrease the lag time it takes to downshift. The reason I suggest the GOPedal is because it comes with a 30 day money back guarantee in case you are not happy with it.
Keep in mind though that the AutoFlash and the GOPedal go hand in hand. The GOPedal improves your throttle response, and the AutoFlash updates the maps of the TCU to allow the gearbox to improve shift times and bypass the torque limiter.
Hope this helps!