There are only two ways to find out, either trying it out or using the pain in the ass to use advanced calculator.
As a guess, yes. Because base Atk is always there for you, and doesn't just vanish when something sneezes on you like Vigor does. Also, more HP, which is a problem for Water.Hardcap.
However, going above that can still help you. To my understanding, having 200% Vigor means that you still get 100% Vigor at 83% HP. In other words, overcapping should make Vigor slightly more reliable. That said, Vigor is reaaaally hard to overcap so you don't really need to worry about it much.