The seams are not texture related, it has to do with how ue5 recomputes tangents for the skin cache. Which is needed since we use strong morph targets, or there are lighting issues that look even worse. It's just a technical limitation we have to deal with, not a simple texturing error.
It is a long lived unreal engine issue
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Sadly the solutions there are outdated or not working for our case.
We even did C++ changes to the engine source to reduce the seams to the most possible minimum. Trust us we know what we are doing, these things are just not as easy as it seems, and game engines have become way more complex since Skyrim
About next-gen adult game, remember that is how we called it almost a year ago, not now. Back than UE5 just came out, and we considered UE5 to be next-gen and our game was one of the first to use it.