Go into the stick setting area of the game and move your stick around. Pretend your in a fight and trying for the shot. Watch the lines in the "Blue box" and see if they are smoothly moving up and down forming a graph. If your getting spikes and such, adjust your dead band slider on which ever axis is "bouncing" all over the place.
The reason that the "don't move your stick so fast" error was added..... or so I hear.... was because some people were "gaming the game" and yanking their stick all over the place when they had someone on their "6". This caused their plane to look like....due to internet lag.... it was turning one way, then the next picture another and so on, making it impossible to hit. As a real live plane would tear itself apart doing this, HTC fixed it so ya couldn't do it.