for any given bow set up easton generaly gives choices for what aluminum shaft is ideal. Im in the process of setting up my browning eclips slx, and i can go two ways, either the traditional narrower shaft with a thick wall (22/16) or something wider and thinner (23/15 or 24/13). Anyhow i hear the general trend nowadays is to go with the wider arrows. What do people on this board prefer?