I have a Mystery Ranch Metcalf that I have been hunting with for the past few years. I always feel like my shoulders hurt more than what should be normal after wearing it all day. Any extended trips (meaning multiple days in a row) and my shoulders feel shot. No matter how much I tighten the waist belt nothing seems to work. I also got an FHF rifle sling and that seemed to make the problem worse on my left shoulder where I have it installed right now. Does anyone have any ideas or suggestions for me to help with this problem? Or do I just need to be tougher and it's normal? Thanks in advance.