are your shoulder blades pinched together really tight. If they arent work on that cause you can over extend your rotator cuff if you go through too much range of motion at the top. Another thing is when you lower the weight trying bend the bar and touch your hands without moving them of course and on the way up try to rip the bar apart. Those moves stabilize your shoulders and upper back taking pressure of your anterior delts and rhombs and/or neck.
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