2D / Animate Segments of LineRenderer with Sprite Sheets and Correct Resolution

I have a laser gun in my 2D game that works well but the line renderer is giving me trouble. The sprite sheet I'm using gets skewed when the gun shoots and I want the segments of the line to play an animation rather than a still image. I believe I have all of the assets and code to accomplish this, but I am obviously missing something.

Code (CSharp):

1.  
2. using System.Collections;
3. using System.Collections.Generic;
4. using UnityEngine;
5.  
6. public class AnimatedTexture : MonoBehaviour
7. {
8.     private float iX = 0;
9.     private float iY = 1;
10.     public int _uvTieX = 1;
11.     public int _uvTieY = 1;
12.     public int _fps = 10;
13.     private Vector2 _size;
14.     private LineRenderer _myRenderer;
15.     private int _lastIndex = -1;
16.  
17.     void Start()
18.     {
19.         _size = new Vector2(1.0f / _uvTieX,
20.                              1.0f / _uvTieY);
21.  
22.         _myRenderer = GetComponent<LineRenderer>();
23.  
24.         if (_myRenderer == null) enabled = false;
25.  
26.         _myRenderer.material.SetTextureScale("_MainTex", _size);
27.     }
28.  
29.  
30.  
31.     void Update()
32.     {
33.         int index = (int)(Time.timeSinceLevelLoad * _fps) % (_uvTieX * _uvTieY);
34.  
35.         if (index != _lastIndex)
36.         {
37.             Vector2 offset = new Vector2(iX * _size.x,
38.                                          1 - (_size.y * iY));
39.             iX++;
40.             if (iX / _uvTieX == 1)
41.             {
42.                 if (_uvTieY != 1) iY++;
43.                 iX = 0;
44.                 if (iY / _uvTieY == 1)
45.                 {
46.                     iY = 1;
47.                 }
48.             }
49.  
50.             _myRenderer.material.SetTextureOffset("_MainTex", offset);
51.  
52.  
53.             _lastIndex = index;
54.         }
55.     }
56. }

Line Renderer Inspector
skewed line when shot proper sprite size

 

I also wanted to share the sprite sheet I'm using and mention that the code is intended to build a sprite sheet out of the material and then display the images in order in each segment of the line rendered when laser is shot.