Parry: How would you improve it?

[Lyth]

........So they don't have access to a parry-driven proc.

You're right. Go ahead and wait for a parry proc oGCD then. Wouldn't want to lose out on trait-less Flash or Second Wind in favour of an extra oGCD. Axe-based combat should be all about finesse and parrying, after all.

I don't even think that this is an issue, to be honest. WAR most certainly doesn't need a dps boost relative to the other two tanks. But if you want to make use of an existing, underutilized skill for more variety in playstyle, it's already there. It just needs a bit of an adjustment before people can actually get some use out of it.