I believe I see what you mean now. If I was to say, zoom in a large amount with a 1% sized brush, the beginning of a stroke doesn't start at the exact point I begin to draw it. As the brush size is enlarged it gets rapidly closer to that point.
At the moment that's a limitation of the way the system works I'm afraid with the tapered brush strokes, but I do have that noted down as something to look at for a future revision.
Regarding the cursors, if they're getting in the way you can turn on precise cursors either via the Edit, Preferences menu or by pressing 'C'
Hope that's of some use!