I haven't used torque for so long, I can't remember any measurements. I use an angle gauge, then measure stretch. The big ends check fine. If it takes more torque to achieve proper stretch on any given bolt, it shouldn't affect the big end distortion. Stretch is an indicator of clamping force. If the stretch is within spec, the clamping force should be equal regardless of how much torque it took to achieve it. Variations in the rolling of the threads during manufacturing can affect torque requirements.