Swords, axes and archery have different advantages. I don't see how axes are "op" when a diamond sword, at the same McMMO level, does more damage and has a strong skill (Serrated Strikes).
Our configuration is done so that every skill is equally balanced between eachother, it was carefully set up so as your skill grows up so it would still be fair and balanced. However we already found some mistakes in the past which were fixed immediatelly, I don't see this axe thing as a mistake or something overpowered though =/.