Hola Alberto,
I don't know what is written on your manuals.
In my qrh, max go around conf 3 weight is lower than values on from 3 (same input parameters) as specify in FCTM.
As Tyro Picard says....fly simple. During overweight landing, read and apply qrh proc. After landing make a huge discussion in front a beer about qnh,qrh,from....
Michelda