I wonder if they are going easy with the loading, perhaps with a lower loading rate, until they find out why Vale Beijing was damaged during loading...
Of course both Vale Rio de Janeiro and Vale Italia were built by DSME, which already has a good track record with Vale Brasil, while the ill-fated Beijing was built by STX. Rongsheng-built Vale China is another "wild card", being the first of her kind.
There are some external differences between the Valemax ships built in different shipyards, not to mention Berge's 388,000 DWT VLOCs that are apparently also referred to as Valemax vessels as they have been chartered by Vale, but it would be interesting to see some in-depth comparison between the different ships, e.g. steel drawings and strength calculations.