another thing that I see that will help with steady aim and bow arm fatigue would be to push your left shoulder down so.that everything lines up from your wrist to your elbow and up to your shoulder. That way you are using bones to hold straight instead of so much muscle.
I'll start by saying that I am not a bow shooter at all.
But, as an accomplished Bullseye pistol shooter I'll have to agree with what Bullblaster says. Targeting/aim should be made as effortlessly as possible using locked joints were possible, reducing muscle fatique. I shoot a 45oz. 1911 with one hand to 50yds and learned a long time ago that using the least amount of muscles in a day long match is quite benificial. Also, in pistol shooting limp wristing, limp elbo, actually reduces the inertia of the bolt/slide on low power target ammo. As a round is fired, the hand/wrist/elbo retracts with the force. This leads to terrible followthrough and inconsistencies. I would think the same could apply to bow shooting???
-This is also a tag on this thread as I'd like to keep track of what experienced bow shooters have to say.
-Steve