No, adding weight to the arms steepens the curve of clamping force. If the weight remains the same changing the springs will move the curve higher or lower in the RPM band however the clamping slope will remain the same. This is one of the reasons we recommend keeping the weight the same on each arm. If you are just trying to change the RPM of the arm application do it with the springs. The need for more clamping force would be dealt with by adding weight.