Big Rivers are closer to center than any other Hill style that I have had. I am not sure that getting inside of 1/8" is going to help with hunting accuracy, unless you like to shoot with the bow more vertical. I padded mine out to match my other bows. If you are referring to a center shot so that it would be easier to tune carbons to it may be something to consider. Part of that Hill thing is to shoot arrows that are not extra long, I think that is why so many Hill shooters prefer wood. Myself, I have had good luck with tapered carbons that are my standard length. I also have found that the narrow aluminum arrows have advantages over the thin walled wide sizes with Hill style bows, as in 1818,1918, and 1920s. I still prefer wood and have no trouble getting arrows that are cut so I tag my finger with the broadhead when coming to full draw to fly perfect and group as tight as anything else. The trick is no trick, just get the right spine and good hand picked shafts.