Small question about input.acceleration

I want the max amount (-1/1) to be reached on small tilts of the phone, currently, you need to tilt the phone almost 90 degrees to the side to get (-1/1) input, this gives me decent results (multiply current input by some amount so the phone reaches (-1/1) on smaller tilts) however is there a better way to do it so this scales better ?

Code (CSharp):

1.         horizontalInput = Input.acceleration.x * 5;
2.         horizontalInput = Mathf.Clamp(horizontalInput, -1, 1);