Ok, well I'm not 100% what you want to change, so I'll just start firing random info at ya.
Substance painter is mainly designed for generating maps for pbr shaders. Warband does not have pbr shaders so depending on what shader you apply to the material is warband will determine your textures.
From your export settings it seems you'd like to use a diffuse, spec and normal map. so your shader in warband will be specular_shader_skin_bump_high.
In substance I like to limit my channels to base color, specular, normal and opacity. Then change the substance shader to non_pbr. This will get show your model in substance as close as possible to what it'll look like in warband. (Tho it will still look different).
Most of the materials in substance are made for a pbr setup, so will look weird in a non pbr warband mode.
It looks like your diffuse and normal are going to be ok, so you just need to generate a better specular map to get that shiny look.
Direct x for normal map is correct.
So then the output
Diffuse = base color rgb + opacity a
Specular = Specular gray
Normal = direct x normal rgb
Hope that helps, maybe try generating your textures outside of substance first to gain a better understanding.
Exported
