If you have all sliders (rudder, pitch, roll) set fully up that means the stick is very very sensitive to input.
Try lowering at least the first 3 or 4, to make a gentle arch, starting with the 1st at about 1/2 or 3/4 up, the 4th all to the top. That softens the stick setup a bit, without making the input sluggish.
You also might want to add a *little* deadband (about 1 slider height from bottom).
Each time you changed any of the settings, recalibrate the stick.
If you still have trouble, come by the training arena. In the evening theres usually a trainer or some other player online that can help you with your setup.
Thrustmaster TopGun Afterburner II is a good stick, no reason why we shouldnt get it to work properly.