I see...

Your note about disabling the pass 2/ stage 2 operations made sense.

I made a new project, did not do any masking of textures and disabled the 2nd stage of pass 2. In the earlier reply I think I had to disable AlphaOp because I was using alphamap in the previous passes. I suppose I could have done that in the 2nd stage as well.

Here are some shots for comparing shadow, diffuse light, and just a detail map.
web page