You may also want to check you tension calibration if you have not. The tension you initially see when the machine locks out is what you want to see. Most machines are adjusted at 60 pounds but you may want to check a range of tensions. Like 50, 55, 60, and 65. To make sure it is linear.
I have the ability to drive people crazy, not sure if I was born with it or I learned it but I'm damn good at it.