I sit here quite hours and looking for differences for my old Seasonic SS330-GB and look the pictures for a SS380 and a Corsair VX450W. But the only differenz i can find is the capacitor, that seem to be more bigger in the VX450.
So here is the idea, replace the org. capacitor ( org. 180µF ) to a bigger one 250-280 for example and get more output Power on all rails?