x6x tablet pen calibration

[poh99]

I have put a clean WinXP Tablet PC install on an x61 tablet, and everything seems to run great. One issue I am having is the actual calibration. My users are complaining that it isn't exactly on the arrow cursor.

Re-calibrating does not seem to help, even calibrating in portrait and landscape mode.
I do notice on the calibration screen, there is a blue boarder around the screen that runs between the middle of the crosses. I also get a system beep when calibration is complete and clicking OK.

Any help is appreciated as I have several of these to image. I have restored one to a factory image, and it seems a bit closer, but still somewhat off.
Is this just normal and expected of tablet PCs? Maybe tilting the pen during calibration and I should not?
I am using drivers from the Lenovo site.

Thanks for any help or advice.