When I flat bench the one side of my back feels like it's pushing out more than the other side. This results in me feeling very lob sided when benching. It's not that much of an issue on the lighter sets, but I find I can't evenly distribute the power on my heavier sets as my back is not even on the bench.
It feels like the one lat or shoulder blade is sticking out and the other isn't at all. It feels normal when I'm laying on the bench with my arms up. But the moment I unrack the bar I can feel it.
Any ideas please? If I wasn't very clear in my description please let me know and I will try and explain it better