I'm debating a similar pack setup. Currently I have a Granite Gear Blaze AC 60, which is a more robust version of the Crown AC 60. I tried to switch to the the Crown, but found my torso fit somewhere in-between regular and long.
To give you an idea of my needs, I've steadily moved my 3 season base weight down to about 14 lbs excluding pack, which consists of a tarptent SS2, down quilt, Caldera 2qt system, GG pad and neoair short etc. On a 4 day trip, I find that my packed weight can start as high as 30+ lbs when fully loading up on water (4L). I usually take most of the group gear to make sure my girlfriend has a great time on the trail!
I have found the Granite Gear suspension system to be incredibly comfortable and rigid, and the load lifters offer a great way to move weight between the shoulders and hips. Unfortunately, the Blaze weighs around 50 Oz with hip belt pockets, so I've been actively seeking a lighter pack that fits and distributes weight well, while maintaining the capability of packing > 50 L.
I just received a Mariposa yesterday, which I have so far found to be much less rigid. In particular, it seems the hip belt system becomes inadequate after the pack becomes sufficiently loaded. The stays distribute the downward force to the fabric at the bottom of the pack, rather than to the belt like the GraniteGear system. The belt is only connected to the pack via a single hefty Velcro attachment, which seems to allow the belt to "curl" and not uniformly receive the weight. The overall sensation is the bag sagging more, and thus putting more of the weight on your shoulders. It does not seem to move with you, which I think is important when climbing fairly technical terrain like you see in the whites. The load lifters are quite curious, since the attachment point to the pack is some fabric on the hood rather than the rigid frame. I can see how the load lifters might do "something" to pull the pack closer, but nothing like they would if connected to the frame.
I do think the Mariposa is very comfortable with less weight, arguably more comfortable than the Granite Gear given the bent stays and soft backpad. With all this said, you might already have a good idea of the suspension since it looks very similar to the Gorilla.
I've decided to order the ULA Ohm 2.0, which looks to have a somewhat smaller capacity, but a better suspension for a similar weight (29 oz). I am a little concerned about the change in suspension between the Ohm and Ohm 2.0 (the stays no longer connect directly to the hip belt), but it seems like ULA is very well known for their pack comfort and weight bearing capability.
If you are interested in a pack around the weight of the Crown AC, you might want to check out the ULA Circuit, which at the listed weight (39 oz), might be the perfect load hauler you are looking for. I personally want something more around 30 oz, and have also considered the HMG Porter, however, the cost is greater (300 instead of 200) and I am really starting to waste a lot of money with all the back/forth shipping :)
Hope that helps!