Another fix for the midpoint issue would be to create a dead space threshold -- for example, if the threshold is set at 5 pixels then any area where a 5 pixel m

Another fix for the midpoint issue would be to create a dead space threshold -- for example, if the threshold is set at 5 pixels then any area where a 5 pixel movement would change the bubble target is turned into non-clickable space. Possibly all potential targets could be highlighted in a different color, to indicate that the system isn't sure where you want to click.