Can't increase mouse sensitivity

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

Solution 1:

Have a look at this answer: https://unix.stackexchange.com/a/177640

Basically:

• Use xinput list to find the name of your mouse device
• Run xinput set-prop 'Name Of Your Mouse' 'Coordinate Transformation Matrix' 3 0 0 0 3 0 0 0 1

You can change the 3s to whatever value you want (larger = increased speed). Leave all the other numbers the same. You'll need to make the command run on startup, since it only lasts for your current session.