Sounds like you need to adjust the DEADZONE on your axis.
Click the CURVES tab and then right click.
You should see an option to set the DEADZONE.
You can make this large or small and you can test it to see the effect in Freetrack. Check also the other options in there to soften out the reaction of your LED's in relation to the amount of Head movement experienced in the game.
Depending on how many DOF you're using, it may mean setting ALL 6 Graphs, or if your like me (playing IL2 just now) I only have a 1 point cap and only have to set the deadzones on the Rotation Tab in the 2DOF curves called YAW and Pitch.
Good Luck
Hope this helps