Projectile Trajectory Precision

I wrote a script to calculate the trajectory of an arrow firing from the player. I have a gameobject, as a child inside the player, to indicate where the missile fires from. I get it's destination with Camera.main.ScreenToWorldPoint(Input.mousePosition).

 Vector2 direction = Camera.main.ScreenToWorldPoint(Input.mousePosition);            
             utilities.SetTrajectoryPoints(trajectoryDotsCache.transform.position, direction, trajectoryDots.ToArray());

Then, I call a Trajectory Calculator and it takes the origin and destination positions and draws a sequence of green dots to draw the path from A to B.

 public Vector2 SetTrajectoryPoints(Vector2 posStart, Vector2 direction, Transform[] trajectoryDots)
     {
         //Debug.Log(direction.y);
         //float magX = (posStart - direction).magnitude * ((direction.x > 0) ? 1 : -1);   
         //float magY = magX * ((direction.y > 0) ? 1 : -1);
         
 
         float finalX = direction.x;
         float finalY = direction.y;
 
         //Velocity(u) = Mathf. Sqrt((x * x) + (y * y));
         float velocity = Mathf.Sqrt((finalX * finalX) + (finalY * finalY));
         //Angle = Mathf.Atan2(y, x);
         float angle = Mathf.Rad2Deg * (Mathf.Atan2(finalY, finalX));
 
         float tTime = .1f;
         Vector2 pos = Vector2.zero;
 
         for(int i=0;i<10;i++)
         {
             float dx = velocity * tTime * Mathf.Cos(angle * Mathf.Deg2Rad);
             float dy = velocity * tTime * Mathf.Sin(angle * Mathf.Deg2Rad) + (Physics2D.gravity.magnitude * tTime * tTime / 2f);
 
             pos = new Vector2(posStart.x - dx, posStart.y - dy);
 
             if (trajectoryDots != null)
             {
                 Transform dot = trajectoryDots[i];
                 dot.position = pos;
                 dot.gameObject.SetActive(true);
                 dot.eulerAngles = new Vector3(0, 0, Mathf.Atan2(finalY - (Physics.gravity.magnitude) * tTime, finalX) * Mathf.Rad2Deg);
             }
 
             tTime += .1f;
 
             //Debug.Log(pos);
         }
 
         return pos;
     }

In the example below, note the green dots stretch off into the distance. What I want is for the calculated arch to reach where the red mark is located in the picture (this is an indication of where the mouse click happened).