Surf как в Counter-Strike для Character-Controller

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
 
public class BodyMove : MonoBehaviour
{
    [SerializeField]
    [Range(0.0f, 25.0f)]
    float minSpeed = 10f, maxSpeed = 25f, xSense = 3.5f;
    [SerializeField]
    float gravity = -9.8f, staticJump = 15f, rayDistant = 1.1f;
    float jumpSpeed = 0, speed = 10f;
    bool secondJump = false, isGrounded, surf = false;
    Vector3 contactVector;
    CharacterController charCon;
    void Start()
    {
        speed = minSpeed;
        charCon = GetComponent<CharacterController>();
    }
    void Update()
    {
        float deltax = Input.GetAxis("Horizontal") * speed;
        float deltay = Input.GetAxis("Vertical") * speed;
        Vector3 movement = new Vector3(deltax, 0, deltay);
        isGrounded = Physics.Raycast(transform.position, Vector3.down, rayDistant);
        movement = Vector3.ClampMagnitude(movement, speed);//Ограничение движения по диагонали(а так же ограничение скорости, равное переменной speed)
        if (isGrounded)
        {
            secondJump = true;
            jumpSpeed = 0;
            if (Input.GetButton("Jump"))
            {
                speed = (speed >= maxSpeed) ? speed = maxSpeed : speed + 1;
                jumpSpeed = staticJump;
            }
            else
            {
                speed = (speed > minSpeed) ? speed -= 0.08f : minSpeed;
            }
        }
        if (secondJump && !isGrounded)
        {
            if (Input.GetButtonDown("Jump"))
            {
                jumpSpeed = staticJump;
                secondJump = false;
            }
        }
        jumpSpeed += gravity * Time.deltaTime * 3;
        movement.y = jumpSpeed;
        movement *= Time.deltaTime;
        movement = transform.TransformDirection(movement);//Преобразование направления в глобальные координат
        if (surf && contactVector != null)
        {
            movement += new Vector3(-contactVector.x, 0, -contactVector.z) * (-speed - (speed * 0.3f)) * Time.deltaTime;
            surf = false;
        }
        transform.Rotate(0, Input.GetAxis("Mouse X") * xSense, 0);//Поворот туловища
        charCon.Move(movement);
        //Debug.Log($"Speed {speed}");
    }
    void OnControllerColliderHit(ControllerColliderHit colObject)
    {
        if (!Physics.Raycast(transform.position, Vector3.down, rayDistant))
        {
            contactVector = colObject.normal;
            surf = true;
        }
    }
 
}

if (surf && contactVector != null)
        {
            movement += new Vector3(-contactVector.x, 0, -contactVector.z) * (-speed - (speed * 0.3f)) * Time.deltaTime;
            surf = false;
        }
void OnControllerColliderHit(ControllerColliderHit colObject)
    {
        if (!Physics.Raycast(transform.position, Vector3.down, rayDistant))
        {
            contactVector = colObject.normal;
            surf = true;
        }
    }