I think with the meat sling/carbon frame packs you are getting a good reliable sit of the hip belt high on your hips and with the meat sling the load centred and close to your back. There is very little lateral movement of the pack too and the pack doesn't pull back on your neck and shoulders. When well set up the load feels lighter.
Im 76 so the my loads aren't huge anymore, but I can still carry the bone in legs and shoulders of a deer up a good hill without much stress. I feel well balanced and my legs and back bits don't hurt - although they do in lots of other situations.
Your pack is excellent but the configuration of just the 2 alloy struts for support and less optimal distribution of the load in the bag means that it is unfair to compare it with the carbon frame meat shelf options.
Your packs are a still a revelation of lightness, robustness and utility and I hugely recommend them. Horses for courses.
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