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Usually I'll keep the full normal map way down beneath everything (for a more exact reference of where all the stuff is, so I can block out the base colours) and I'll also pull the blue channel from the normal map and stick it way up top of the stack and set it to multiply (so I've a fairly accurate and not overpowering guideline for details).
Or if I've baked a AO map, I'll just use that as my guide, multiplied over the top of stuff.
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