I noticed a very slight difference on mine also. Very stiff to try to adjust, seems to be fine now, but then this coming Thursday, I'll be out for a week, so I'll get to test if fully. Over the Independence Day holiday, it carried fine with upper teens weight wise, I'll have low 20's for my coming trip, depending on water carried. I hiked continuously for 3.5 hours, stopping briefly for water breaks as my old arms cannot access the water bottle pouch unless I partially take the pack off. My shoulders and hips feel no sore spots or rubs. I left my hose off to save that oz. or so and brought a Gatorade bottle which added another bit.