I can't help much here, but when I used shoulder holsters, they had tie downs on both sides. I always wore my pistol holster muzzle up at about a 30° angle which helped in concealing better and more natural access to the thumb snap, and a pull down draw. I still like the idea of the shoulder rigs, but they are sort of difficult to work with for me, and somewhat limited to wearing under heavier outerwear. These days, I like things that don't move around a lot when I do. The shoulder rig system will move with you, and you may find it difficult to deal with, and get things the way you'd like. IMO....you've got your work ahead of you. I don't think I could carry with a shoulder rig without tie downs. Those will hinder movement even more. Good luck with it.