Render Texture Screen Effect: Custom Shader Not Tiling

I am by no means a Shader programer by any stretch. I'm just fumbling through. I've managed to implement a camera dissolve effect which will gradually make what a camera see appear using a noise pattern and superimpose it over a static background -- rendered by another camera.

I've got it working almost exactly as I imagined it in mythology head. Except that the shader I'm using, that I found in the internet and, is not tiling the noise image when I'm blitting the Render Texture. No matter what values I use for X and Y Noise image tiling -- it has no effect.

I've tried several changes to the shader with suggestions I've found but nothing works. Can I get a hand from the Unity Answer Community?

Below is the current working shader code:

 Shader "Custom/Unlit/DissolveEffectShader"
 {
     Properties
     {
         _MainTex ("Texture", 2D) = "white" {}
         _NoiseTex ("Texture", 2D) = "white" {}
         _EdgeColour1 ("Edge colour 1", Color) = (1.0, 1.0, 1.0, 1.0)
         _EdgeColour2 ("Edge colour 2", Color) = (1.0, 1.0, 1.0, 1.0)
         _Level ("Dissolution level", Range (0.0, 1.0)) = 0.1
         _Edges ("Edge width", Range (0.0, 1.0)) = 0.1
     }
     SubShader
     {
         Tags { "Queue"="Transparent" "RenderType"="Transparent" }
         LOD 100
 
         Pass
         {
             Blend SrcAlpha OneMinusSrcAlpha
             Cull Off
             Lighting Off
             ZWrite Off
             ZTest Always
             Fog { Mode Off }
 
             CGPROGRAM
             #pragma vertex vert
             #pragma fragment frag
 
             #include "UnityCG.cginc"
 
             struct appdata
             {
                 float4 vertex : POSITION;
                 float2 uv : TEXCOORD0;
             };
 
             struct v2f
             {
                 float2 uv : TEXCOORD0;
                 float4 vertex : SV_POSITION;
             };
 
             sampler2D _MainTex;
             sampler2D _NoiseTex;
             float4 _EdgeColour1;
             float4 _EdgeColour2;
             float _Level;
             float _Edges;
             float4 _MainTex_ST;
 
             v2f vert (appdata v)
             {
                 v2f o;
                 o.vertex = UnityObjectToClipPos(v.vertex);
                 o.uv = TRANSFORM_TEX(v.uv, _MainTex);
 
                 return o;
             }
             
             fixed4 frag (v2f i) : SV_Target
             {
                 // sample the texture
                 float cutout = tex2D(_NoiseTex, i.uv).r;
                 fixed4 col = tex2D(_MainTex, i.uv);
 
                 if (cutout < _Level)
                     discard;
 
                 if(cutout < col.a && cutout < _Level + _Edges)
                     col =lerp(_EdgeColour1, _EdgeColour2, (cutout-_Level)/_Edges );
 
                 return col;
             }
             ENDCG
         }
     }
 }