I had to sew up mine on a hunt because the shoulder strap almost ripped off the belt. This is something everyone should check. It showed wear before I left for my last trip....but a month on the mountain was too much for the old girl.
I will probably add some e6000 and a wear pad on my other Kifaru belts to eliminate this from happening to them.
As for pulling you backwards, think center of gravity......where is yours? It's different for a tall, short, fat, skinny......etc. find your CG and keep weight as close to it as possible. Load the belt as much as possible and you'll be fine with minimal shoulder pressure.