Overall I did not care for the 215Gear single-point bungee sling. I found it to be about 6" too long, even when adjusted to its shortest length. If it were 6" shorter it would hold tighter to my body, and the rifle would hang in a better position. And the bungee material would still have allowed me to shoulder my rifle on either shoulder, make shoulder transitions, and transition to pistol without fear of the rifle flopping all around. Of course there would still be more movement than a 2-point sling simply due to configuration. So the sling either needs to be shorter, or I need to be bigger around.
Here you can see the difference between when I maintain control over the rifle, and where it falls when its let loose. It comes to rest several inches below where I feel it should be.
Try wearing it over your body armor. It should fit just right.