It's been almost 9 months since I worked on this project, but I'm back to it now. I've revamped the hip belt. Before, there was a big gap between my back and the top of the belt, rather than hugging my lumbar. I brainstormed different ways to fix this, but in the end, it was very simple. I just cut the belt in half, angled the edges where the two pieces would form a V, and sewed them back together. This effectively removes the extra material that was causing it to gap in the back. It feels much more snug and secure now.