I would change the default values of min_width and max_width, or at least of max_width.
Since these values are used to determine the minimum and maximum number of points that a cluster could have in order to be considered, the fact that a cluster could be composed of many people close to each other should be taken into account. 
Thus, I would increase the default value for the max_width parameter to something like 4, which corresponds to the width of 4 people.