Whenever I train my chest- especially on the peck dec machine I tend to feel the stretch mostly in my shoulders rather than my chest, even when I squeeze and hold during the contraction. I have adjusted the seat height, thinking perhaps that I am sitting too high or too low, but I can't figure out what I am doing wrong. Any thoughts? I have also had this problem when I do incline bench press as well (with dumbells)...Any suggestions would be appreciated