I switched a while back to a Osprey Aether 70. It weighs a little over 4 pounds and carries about 4,200 square feet of gear.
Although a thru-hiker wouldn’t carry such a weight - it is rated for 55-65 pounds. I carried about 35-40 pounds and was very pleased.
However, it does not have and hip belt pockets. I’d just go to Walmart and get a cheap fanny pack and rig up some way to attach it to your hipbelt. I do that and have a holder of a 1-liter water bottle on the other side. If you have anything susceptible in your hip belt pocket (camera, etc.) remember to keep it in a zip lock or something to guard against rain.
You mention problems with hip belt comfort. The Osprey has something they call a thermo hip belt that can be shaped to your specific needs. But you have to go to a special dealer who has the equipment (some type of heating device) to mold the hip belt to you. I know if you buy it at REI they will do the shaping for you.
The Unknown Hiker