Also the head movement should increase with the increasing fatigue level, that works also without TIR as long as the movement is limited not to loose sight of the sights.
It could be related to the TIR-setting in the conf.ini -> No TIR -> less movement; with TIR -> more movement which can be neutralized by actual head movement.
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Win 7/64 Ult.; Phenom II X6 1100T; ASUS Crosshair IV; 16 GB DDR3/1600 Corsair; ASUS EAH6950/2GB; Logitech G940 & the usual suspects
 
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