I always thought that the tracking of the ride, specifically the area you mention, felt the way it is due to the engineering and manufacturing that created it. I don't believe its an intentional effect, but is likely due to how the track is shaped in perfect circles. Specifically for that moment on the first drop, it is a perfect circle in the down motion, and a perfect circle in an upward motion. There is no transition or lead into the change from downward to upwards motion, making the transition a little jarring. You can find similar sensations on smaller Arrow mine trains caused by the exact same thing.