X is Faster then Z

I have a code that makes the player moves a ball

         if (speedx < 5 && Input.acceleration.x > 0) {
             rb.AddForce (x * speed);
         }
         if (speedx > -5 && Input.acceleration.x < 0) {
             rb.AddForce (x * speed);
         }
         if (speedz < 5 && Input.acceleration.z > 0) {
             rb.AddForce (z * speed);
         }
         if (speedz > -5 && Input.acceleration.z < 0) {
             rb.AddForce (z * speed);
         }

the speed value is 1000 x is working normally but z is too fast, i checked the values of z and input.acceleration but they were normal, i tried reducing the value of the speed for z but the problem when the player has to keep holding it for long for it to order to move is there a way to fix without reducing the speed?

PS:- the speed is 1000 for both x and z but z is still faster then x although they both have all same values