My AC joint on my left shoulder sticks up quite high and always has. When I started doing pin pressing (slight decline/incline) while doing the layers I did not have any pain. After pin pressing for a couple weeks the pain was there just in the left shoulder AC joint. I went away from pin pressing and have had almost no pain in that AC joint. I know I am packing my upper back and traps so I’m sure I have a solid base and I’m not “attacking” the bar; gradually pressing until it moves is what I’m doing. My question is can my “sticking up” AC joint on my left shoulder prevent me from doing pin presses? Or maybe its only a getting set up under the bar issue? I have been doing the layer system just taking a little longer rest periods due to having to rack and un-rack the bar. Thanks for you help.