The lever on the pedal assembly where the cable attaches . The length would determine the amount of cable it pulls out . Is it 1 inch or 2 inch long is what I mean. Also have you measured the length it needs to fully disengage the clutch yet . This is where we would need at least 2 people I think to watch the movement and measure it . Guess what I am asking is kinda like the ratio of the brake pedal . You have some great tech going here . .

The old rod assembly's used to travel about 2 or 3 inches if I remember correctly has been along time since I seen one move . Maybe a service manual would have the info .