Corban's sheet also explains he is a master at breaking things. Also, there was no metric for how hard his cannonballs actually were. There is no comparable metric for how much they were hardened. Even hardened three times over that would not be enough to stop themselves from getting impaled on something like a giant crystal spire when they meet it at breakneck speeds. 

You can continue gas-lighting and playing the deflection game as long as you wish. I am removing myself from the conversation until Shawdus has met out his judgment, at which point you may whine or cheer to your hearts content.