Way back in the early 70's, my Dad was lucky enough to get into a conversation with Fred Bear. One of the things they talked about was cock feather in, out, etc...My Dad says that Fred told him he tuned his bows with the cock feather out, but when he was in the field, he never paid it much attention on hurried shots. That prompted him to mess with it on the target range. It's sounds silly, sort of ancient 4th party information, but my Dad claims that Fred said there was no difference for him with regard to cock feather position.