For farmers carries, use a weight that cannot be bicep curled to avoid using the bicep to take torque off the shoulder.

“there's a reason why our grip gives up and pull-ups because it's actually protecting our shoulder socket from something it can't stabilize with any carry especially when your hands are down you want to use a weight that you can't bicep curl because if you can do that you'll start to bend the bicep a little bit to take the torque off your shoulder”