Texture Lighting

I'm building a map that has several spiral staircases in it. The stairs have a sloped bottom to them. Before changing any of the texture properties the textures appear as triangles. I'm using a concrete texture and can pan the textures to eliminate contrast between the triangles. But there is a major difference when light is added.
Using Bright Corners does not fix the problem as it only works on the Floor/Ceiling surface not the Slant surface.
Using Unlit makes both surfaces appear the same which is good.
Now the problem of correct lighting effects does not work. I then tried using HighShadowDetail but that did nothing.
I've attached a picture showing one staircase without the textures altered and default lighting. The other picture shows another staircase with Unlit on and HighShadowDetail on. I also have added lighting to this staircase.
How can I get the bottom of the staircase smooth with the correct light/shadow effect?

Still waiting for some suggestions on this one. Any ideas would be appreciated.

Chris
I've tried aligning (panning as I noted) the textures to eliminate contrast, if you mean move them up, down, left or right. If this is not what you mean by align could you please explain.

How do you change the poly count.

Child of Rama
I haven't tried using the special lit flag yet as it's not an issue of getting enough light. I will give it a try it on the slants only as they appear darker than the rest. Who knows it may just work.

Thanks for the replies.