Bigbull answered it well. Other than dropping arrow weight not much you can do to gain serious accurate speed.The only thing else I would say, if its really important, just lie. As long as nobody shows up with a chronograph, it should work. If they do show up with a chrony, just fake an injury. If they ask to shoot your bow, tell em your that boy in the plastic bubble and your highly prone to infections which are not only passed by inhalation but also passed by other peoples hand grease. You might tell em you have John Travoltas autograph by the way, and hes a really great guy. That will add some realism to your story.If they ask how you can be out of the bubble, tell em your holding your breath, and have been for about an hour. Now tell em all this talking is winding you, and you must get back to the hospital and take a little refresher nap in the oxygen tent. That should work. Just lie.