I tried to calibrate my surface to suit my writing style but it is impossible to hit the extreme corners of the calibration tool (specifically the lower. left corner if viewed with Windows button on the bottom). This makes it impossible to calibrate properly. The default works alright but isn't perfect. I've also noticed that as the pen approaches the edge of the screen there is a "jump" of the pointer like it's being sucked to the edge of the screen. Has anyone else noticed this or do I have a dud Wacom digitizer?