I've got a problem increasing my mouse sensitivty and the cursor moves pretty slow at the moment. I've tried using that sensitivity slider in the system settings but it does nothing. I found some articles here and found that I might need to lower the value of 'Device Accel Constant Deceleration', but that's already at its lowest (1.000000). I've also tried changing the polling rate described here:
http://www.urbanterror.info/forums/topic/21844-howto-changing-mouse-polling-rate-on-ubuntu/
but no difference between 100Hz and 500Hz. What else can I do?

Ubuntu 12.04, MS Intellimouse Explorer 3.0

PS: xinput --list-props 8 | grep Accel shows this:

Device Accel Profile (268): 0  

Device Accel Constant Deceleration (269):   1.000000  

Device Accel Adaptive Deceleration (270):   1.000000  

Device Accel Velocity Scaling (271):    10.000000