I have this exact model and have attempted to use trackpoint under Ubuntu and it is just slow and I'm constantly overshooting my target. I'm so much better with the trackpad that I really wonder how people that use trackpoint swear by it. I must be missing something.
Increase the sensitivity to max and try to guide it using just light touches. It's supposed to be relaxing on the fingers, if there's any finger strain, your sensitivity is too low.
