Curvature from mesh baking has always been flaky in real world scenarios. You get much better results generating it from normals in designer as a rule. You might get better results if you average normals for that bake but it's unlikely to be perfect .
Hi Fwap, Do you use SD5 or an earlier version? This can be due to the fact you use new engine features from SD5; to check the nodes that use new features you can click on: "Tools=>Preferences=>Projects" and set the "Compatibility Mode" to Substance Engine v4, this way you can get a visual feedback of the nodes that use new…
That's fine, hearing that you guys have this issue on the agenda is already great. Cause the gradient maps are a great feature, I'm glad that you have some love for it. :)
Currently you can't load Texture2D objects in a texture input (it's planned, but not implemented yet), that's why you need to load your textures as Substance textures in the content browser.