Anyone have any tips or tricks on fitting pack stays? From what I've read, they basically need to fit evenly against the back, and then at the top where they no longer touch the back kick back away from the head. I haven't found anything other than that though. I've probably had the pack on and off a hundred times so far, and it doesn't feel like I'm making that much progress. I realize it's going to be a slow process, but I feel like I may be missing something here. Any advice would be greatly appreciated.