[Tutorial] Ripping Guide for Animal Crossing New Horizons

[dogbiscut]

Figured I'd leave this here since I've been trying to make sense of the shader setups. Here's a list of all of the texture suffixes I've seen / should be used for submissions:

Code:

_Alb = Albedo, RGB = diffuse, alpha = trans (_Crv)
_AlbEx = Albedo layer
_AlbGry = Albedo, greyscale
_AlbOry = Albedo layer
_Crv = Trans (normally the alpha channel of "_Alb", only seen separately with "mydesign" models)
_Dit = Dither pattern
_EdgCod = Edge light coordinate color
_Emi = Emission
_EmiOry = Emission layer
_Emm = Emission, alternate ("_Emi" is more commonly used)
_EmmOry = Emission layer, alternate
_ETxt = Emission for "Countdown" text
_FlrGrd = Floor color grid? (Only one is "RoomTexShareTextureFloor_FlrGrd")
_FlrOcm = Floor occlusion map?
_Grd = Color grid
_GrdEdge = Color grid, edge (Only used for Grass and GrassSnow)
_Hgt = Height map?
_Ind = Bump map?
_Mix = Various, combination of occlusion ("_Ocl"), edge light coordinate ("_EdgCod"), roughness ("_Rgh"), metalness ("_Mtl"), and specular ("_Spc")
_Mix2 = Various, only used with "ReFabric" materials
_Mtl = Metalness
_Nrm = Normal map
_Nrm2 = Secondary normal map
_Ocl = Occlusion
_OclMlp = Occlusion, alternate?
_OP = Opacity
_Rft = Lightwarp
_Rgh = Roughness
_Sft = Lightwarp mask?
_Spc = Specular
_Spm = Specular, alternate name

Additionally, it seems all clothing (or at least the shirts specifically) follow the same pattern for their "_Mix" textures -- R = _Mtl (metalness), G = _Ocl (occlusion), B = _EdgCod (edge light coordinate), A = _Rgh (roughness).

Would you happen to know why the normal map is doing this? 
Here it is without the normal map,
   
then plugged in it makes everything black,
   
but when the map is inverted then the back side almost looks right, just without lighting.
   
and then when it's all exported and in HLMV it's super shiny. 
   
I have absolutely no idea what I am doing.