the aerodynamics of that setup will only create unwanted drag and cancels out the purpose of using short vanes in the first place.
the whole purpose for using short vanes is to eliminate as much drag as possible.
i did quite a bit of research a while back with blazer vanes when they first came out.
the best placement to place the fletching as far aft as you can. if a release is used you can put them nearly on the end if you shoot traditional then you need a little more room for your fingers.
everything is debatable though.