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When combining(overlay in photoshop) be sure to get rid of the blue channel of the generated normals, as this will flatten the depth of the baked normals.
What works for me is paint the blue channel of the generated normals with a 50%grey and the brush set to multiply. This results in what id like to call a 'grey normal map'.
What also could be done is just overlay the normals without edited any channels and then flatten them. Now use the Normal map filter and select 'normalize only'. (Tho' I am not 100% sure about this method.)
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