Thank you, I knew this software but I didn’t know that it made this kind of conversion.
I just tested with substance designer and I still have the same problem. but I just understood that it’s the bake of my normal that is the source of these issues. At the place of the seams cut there are variations in the colors from one side to the other, strangely It does not seem to pose any problem by using it as bump but it seems logical that it disturbs the algorithm which converts the normal in height.
I just tried with a simpler unvrap and I’m already getting better results.
I think I would never manage to have something clean with this kind of software but I can use it as a base and make touch-ups in painting.
I managed to get this kind of result to have domed parts less shiny and metallic than the hollows
