There is not one absolute value that will work every time. When the Triangulation command tries to create a triangle between three points, it actually compares the angle of the triangle legs, not the distance between the points ( and it does this internally in Radians, not Degrees). So if two of the triangle legs are very long relative to the third (i.e. very long intervals between template drops) the angles will be smaller.
As you mention, 0.01 is probably the most often used value. If you ever find that this value fails, you could reduce the template drop interval, or make the value larger than 0.01.