Chris:
Since Louis hasn't weighed in yet, I'll give your original question a shot.
(Lou, please smack me down if you disagree).
I've messed about with a number of monitors at various heights and angles. The angle thing is the easiest to set up, as you want the speaks "on axis" at your listening position for fullest FR and imaging. My GMA Callistos (on 24" stands" have adjustable bases and the angle is critical.
Height is another thing, as it varies with room size, room layout, room treatment. However, lower almost always results in better room reinforcement of the lowest bass the monitor is capable of. In effect, the floor becomes part of the speaker baffle. As an experiment, with the taller stand, place a piece of cardboard vertically between the bottom of the speaker cabinet and the floor (a "beard"). Tell us what you hear.
Larry