It seems my points are being lost. I'm not against using third party apps to generate maps, but currently the 'suggestion' is that DDO can create the curvature map from your input maps. However as half a dozen people in the 'support' thread have discovered it fails to account for geometric edges, thus leading to developers…
So I re-created the tests this time to investigate what impact the tangent normal map had on DDO's curvature creation. I simplified the project to just use the one 'metal edge wear' material. It use ID, tangent, object space, and AO input maps. Project assets download link - includes models (blender/obj), input maps, DDO…