I think each screen is different. I have found that I can get reasonable calibration by deliberately missing the mark during the calibration process, by a few millimeters. A bit of trial and error is required, of course.
As to waking from sleep mode just by the pen almost touching the screen, I have noticed the same thing. I don't know what the underlying technology is. But I have found that if the stylus gets disabled, I can navigate to the setup, turn off the stylus, exit setup, re-enter it, and turn the stylus on, and it will work again with no need for a restart. Still annoying, but less so.
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