World Space Diffuse Shader with Normal Map

Trying to create one.

Using the following working world coordinate diffuse shader:

     Shader "Custom/WorldCoord Diffuse" {
         Properties {
             _Color ("Main Color", Color) = (1,1,1,1)
             _MainTex ("Base (RGB)", 2D) = "white" {}
             _BaseScale ("Base Tiling", Vector) = (1,1,1,0)
         }
         SubShader {
             Tags { "RenderType"="Opaque" }
             LOD 150
         CGPROGRAM
         #pragma surface surf Lambert 
         sampler2D _MainTex;
         fixed4 _Color;
         fixed3 _BaseScale;
         struct Input{
             float2 uv_MainTex;
             float3 worldPos;
             float3 worldNormal;
         };
         void surf(Input IN,inout SurfaceOutput o) {
             fixed4 texXY=tex2D(_MainTex,IN.worldPos.xy*_BaseScale.z);//IN.uv_MainTex);
             fixed4 texXZ=tex2D(_MainTex,IN.worldPos.xz*_BaseScale.y);//IN.uv_MainTex);
             fixed4 texYZ=tex2D(_MainTex,IN.worldPos.yz*_BaseScale.x);//IN.uv_MainTex);
             fixed3 mask=fixed3(
                 dot(IN.worldNormal,fixed3(0,0,1)),
                 dot(IN.worldNormal,fixed3(0,1,0)),
                 dot(IN.worldNormal,fixed3(1,0,0)));
             fixed4 tex=
                 texXY*abs(mask.x)+
                 texXZ*abs(mask.y)+
                 texYZ*abs(mask.z);
             fixed4 c=tex*_Color;
             o.Albedo=c.rgb;
         }
         ENDCG
         }
         FallBack "Diffuse"
         }

Trying to add a normal texture channel. My attempt thus far, combining the above with simple normal textures:

 Shader "Legacy Shaders/Diffuse - Worldspace"{
     Properties{
         _Color("Main Color",Color)=(1,1,1,1)
         _MainTex("Base (RGB)",2D)="white"{}
         _NormTex("Normal (RGB)",2D)="bump"{}
         _Scale("Texture Scale",Vector)=(1.0,1.0,0,0)
         _BumpInfluence("Bump Influence",Float)=1.0
     }
     SubShader{
         Tags{"RenderType"="Opaque"}
         LOD 200
         CGPROGRAM
             #pragma surface surf Lambert
             sampler2D _MainTex;
             sampler2D _NormTex;
             fixed4 _Color;
             float4 _Scale;
             float _BumpInfluence/*,_Dimension*/;
             struct Input{
                 float3 worldNormal;
                 float3 worldPos;
                 float2 uv_MainTex;
                 float2 uv_NormTex;
                 INTERNAL_DATA
             };
             void surf(Input IN,inout SurfaceOutput o){
                 fixed4 texXY = tex2D(_MainTex, IN.worldPos.xy * _Scale.z);//IN.uv_MainTex);
                 fixed4 texXZ = tex2D(_MainTex, IN.worldPos.xz * _Scale.y);//IN.uv_MainTex);
                 fixed4 texYZ = tex2D(_MainTex, IN.worldPos.yz * _Scale.x);//IN.uv_MainTex);
                 fixed3 mask = fixed3(
                     dot(IN.worldNormal, fixed3(0, 0, 1)),
                     dot(IN.worldNormal, fixed3(0, 1, 0)),
                     dot(IN.worldNormal, fixed3(1, 0, 0)));
                 fixed4 tex =
                     texXY * abs(mask.x) +
                     texXZ * abs(mask.y) +
                     texYZ * abs(mask.z);
                 fixed4 c = tex * _Color;
                 o.Albedo = c.rgb;
 
                 texXY = tex2D(_NormTex, IN.worldPos.xy * _Scale.z);//IN.uv_MainTex);
                 texXZ = tex2D(_NormTex, IN.worldPos.xz * _Scale.y);//IN.uv_MainTex);
                 texYZ = tex2D(_NormTex, IN.worldPos.yz * _Scale.x);//IN.uv_MainTex);
                 mask = fixed3(
                     dot(IN.worldNormal, fixed3(0, 0, 1)),
                     dot(IN.worldNormal, fixed3(0, 1, 0)),
                     dot(IN.worldNormal, fixed3(1, 0, 0)));
                 tex =
                     texXY * abs(mask.x) +
                     texXZ * abs(mask.y) +
                     texYZ * abs(mask.z);
             }
         ENDCG
     }
     Fallback "Legacy Shaders/VertexLit"
 }

Turns the whole thing black, no matter the value of "_BumpInfluence".

Know where it's gone awry?

Thanks.