My experience is an inch difference when shooting fingers over a release whether shooting a recurve or compound. My recurve I shoot a 28" arrow this is because I shoot fingers and that takes up a lot of string area, my compound I shoot a 29" with a release.The "D" loop does not chage your draw length, only where your arm/hand end up. You need to make sure that your string touches the tip of your nose to the corner of the mouth. Any shorter or longer can/will affect your shooting abilities.