AK - nice goat and nice pics. That load actually shows what I am referring to. When strapped tightly, the tops of the frame stays turn inward, around the load. This pitches the load lifters out and the shoulder straps spread further.
Perhaps, something in my physical build makes this more obvious to me. Again, the load you have on isn't an extreme example, like with a sand bag, but the shape of the torso pads on your pack loaded that way would register in the comfort department for me personally. It's bearable and can be adjusted for comfort when I end up with a load like that but it's noticeable. That said, I'd be grinning to carry that goat off the mountain