DoF - a Robotiq Community
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The minimum thickness that can be reliably detected is 1.2 mm according to this thread.  If you are opening and closing your gripper all the way each bit in the register results in moving the gripper approximately .39 mm for the 2F85 and 0.65mm for a 2F140. If you could limit the amount the gripper is opening and closing you still get the same number of steps but they would now be a thinner slice, for instance if you limited the gripper to 20mm each bit in the register becomes approximately 0.17mm and may help you to register if you have a part or not, hard to say though without trying it.