The main problem people come up against with short brace bows is wrist slap but what a lot tend to over look is the fact that along with the low brace they are also shooting a draw lenght that is too long and are forced to lock their elbow.
Something else to consider is that normally when you are dealing with a low brace height bow then you are also dealing with a riser that has alot of reflex in it. A reflexed riser is also more sensitive to torque induced by the shooter before or during the shot.
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Longer duration or longer distance?
Wouldn't it be the same? If the powerstroke of the bow is longer then in my mind the string would be in contact with the arrow for a longer duration which would be longer time as well.
Yes and No. If the powerstroke is longer then the arrow should, theoretically, be traveling faster. If the arrow is traveling faster then it should cover that distance in a quicker time. I don't have the mathematical figures to show you this but Vic, 500 fps, actually posted it some time ago on another forum. The two factors sort of cancel each other out for the most part....which leaves only the issue of the actual physical distance.