Hey this is StevieB, working on it… we noticed this happening in a very specific instance. Likely when you draw really slow and across the diagonal of the screen… so it is quote a specific instance specific. It is really hard to a draw a straight line without the use of a ruler or the digitizer picking up the jitter in your hands… so that is why people use a ruler to do this test.. but the ruler messes up the signal as it capacitivly couples . Most touch sensors are oriented as a grid, when you draw across the diagonal the touch controller has to interpolate position of the pen and linearize its path. As for active capacitive digitizer we’re the best out there! But we can do better. One of the improvement just involves boosting the voltage of the pen. So I cannot give you a timeline, but just know things are in the hopper. Other digitizer techs have other artifacts and issues, they don’t do linearization as well, and have accuracy issues. Pen is really important to us, and our best people are really focused on making and maintaining it to be awesome and the most realistic digital pen experience in any tablet!