The ride is programmed with a set amount of energy in the LIM launches... the control system doesn't have any ability to weigh the trains and adjust the launch power like some other coasters do.
Because of this, if you get an empty train car, the main launch (after turntable into gravity zone) provides the most force and biggest airtime at the top of the hill. More than it would if you got a car full of riders. Of course because the train is empty, it doesn't carry the same momentum as one full of guests; so by the time you get to the drop after the helix (second airtime spot), the car is traveling about the same speed as one full of other riders - this spot doesn't really have much difference.
The same thing applies for the third launch out of the false ending.