Line Renderer Edgy/Jittery

I'm fairly new to Unity and I'm trying to make a simple 2D platformer. I'm currently trying to implement a trajectory arc using the line renderer, which I have managed to do. Unfortunately, it appears to be edgy and jittery, especially on the end, as I manually set 'position count' depending on whether it intersects with game objects or a camera edge.

http://imgur.com/a/ODzYt

 void Update()
     {
         if (Input.GetButtonDown("Fire1"))
         {
             _isMouseDown = true;
             _beginMouseDownTime = Time.time;
         }
 
         if (_isMouseDown)
         {
             float sin = Mathf.Sin(((Time.time - _beginMouseDownTime) * 0.5f) - Mathf.PI * 0.5f);
             float power = Mathf.Lerp(0.2f, 1f, (sin + 1) * 0.5f) * VelocityMultiplier;
 
             Vector3 pos = new Vector3(transform.position.x + 0.2f, transform.position.y + 0.2f, 0f);
             Vector3 vel = new Vector3((power * 1.2f) / 2f, power, 0f);
 
             _lineRenderer.positionCount = LineRendererVertices;
             for(int i = 0; i < LineRendererVertices - 1; i++)
             {
                 if(lineIntersects(pos))
                 {
                     _lineRenderer.positionCount = i;
                     break;
                 }
 
                 _lineRenderer.SetPosition(i, pos);
 
                 vel += _gravity * Time.deltaTime;
                 pos += vel * Time.deltaTime;
             }
         }
     }
 
     private bool lineIntersects(Vector3 pos)
     {
         if(Camera.main.WorldToScreenPoint(pos).y <= 0f)
         {
             return true;
         }
 
         foreach (GameObject platform in ObjectPooler.instance.GetActivePooledObjectsOfTag("Platform"))
         {
             if (platform.GetComponent<BoxCollider2D>().bounds.Contains(pos))
             {
                 return true;
             }
         }
 
         return false;
     }

Is there a way I can get it to be smoother?