final clutch value is Transmission->getClutchPower
transmission telemetry displays clutch input state which is related to what you read from the input device but the final output(clutch power) is filtered with the clutch engagement curve. so the clutch state is the input to the clutch curve and the output of the curve is the power.
btw I have tried using logitech g29 years ago with unreal4, didn’t have any problems with the clutch.