Well, i wanted to fix it, but there is not any bugs (Only the Shell attachment).
So, before you say "Smoothing errors, go home and leave this place", i suggest you to take a look to the normal map, with attention. You will see that the Rec is a bit "smoothened", that makes something look a like a Smoothing errors.
I didn´t re-edit the normal, bcz i didn´t want to fuck up it more.
Otherwise, enjoy rate and comment the skin, thanks.