second the aarns, check out the youtube video: aarn part 2 or something like that. IT shows how the pack is not actually attached to the hippbelt except at one small point. Allowing the hipbelt to move up/down/left/right as your hips move. Also the shoulder straps are connected in a loop at the bottom of the pack. This allows you to raise one shoulder and the whole strap moves up and down, same for the other shoulder. The strap that you normally pull to tighten down your shoulder straps slides up and down when the shoulders are moved-really comfortable stuff. This way, there is no weight on the shoulders. No weight on the shoulders, all on the hips, balanced between front and back. The width of the shoulder straps can be adjusted about 8 different ways for wide or thin shoulders. The hip belt is 2 pieces that are velcro'd to another piece and sit inside a matrix mesh piece that is connected to the back of the pack. Each "Wing" of the hip belt can be adjusted up or down, left or right in milimeters-independently of each other. So if you had one hip bone a tad higher and a tad left of the other, you could adjust the velcro hip belt wings until you had it exactly in line. A vertical stay runs down the center length of the pack and flushs it with your back. A vertical stay runs down each front pocket, lifting the front pocket off your body(its not touching your chest/abs making you sweat, it also doesn't block you from seeing your feet) and putting ALL the weight in the front pockets on your front hip bones. I have the featherlite freedom. Im about your height i have a large torso version. But i think i would opt for a small torso if i had it to do over.
The way to determine your perfect hip belt position is to load the pack up really heavy. Put say 15lbs in each front pocket, 30lbs in the pack. Hike a few hours with it. Where ever you feel pressure on the hip bone, stop, make an adjustment for that hip bone, continue, and adjust again as necessary. After you feel no uncomfortable pressure and =even distribution of weight, leave it alone. Then you can dump your heavy gear, fill in with your lightweight stuff and be good to go.