Thrustmaster joystick problem

Hello there,I just bought a Thrustmaster top gun fox 2 schock pro joystick, the joystick is running nearly perfect accept one thing. When i want to make a heavy action or turn, for example for takeoff, when i pull my joystick completely towards me, the plane barely respond. But at the same time when i take the stick al little bit back to the center it suddenly respond very aggresifly. Does someone has the same problem or can anybody help me??Hope to here from you guys shortly!Niek Jacobs