Unless you practice (a lot) on acceleration runs, I think you'd be faster leaving it in full auto. Even though the shifts are (supposedly) a little slower, the car should always shift at the best time when you are at WOT.
I generally use manual modes in AT for when I am going at a slower pace and the auto wants to shift up when I know I want more throttle responsiveness (say, getting ready for a two lane pass) or engine braking (not too often) or accelerate after a turn (downshift before the turn, rather than have the AT auto downshift during the acceleration out).
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