Kifaru makes 2 type of frames. The loops are on the lite and not on the duplex frame. You actually have the lite frame. When I was researching packs for bulky/hefty loads I saw nothing but complaints about the Kuiu. If your Kuiu fits and works for you great! All I can say is you are the exception!
Here's a post with around 5 pages about "Why no love for Kuiu packs." https://www.rokslide.com/forums/threads/why-no-love-for-kuiu-packs.167898/
Just looked it up, you must be referring to the duplex Tactical rather than the duplex lite. This looks like a much better design than the one I have. Pretty hard to shell out another $400