Parry...

[ZDamned]

I think to make parry useful, they should make it do some damage, as well as block some. Since if we go to google.com "parry" we get:

par·ry
ˈparē/Submit
verb
1.
ward off (a weapon or attack), especially with a countermove.
"he parried the blow by holding his sword vertically"
synonyms: ward off, fend off; More

Where is the countermove eh?

I personally think both tanks should get an On Parry attack similar to Shield Swipe. Give players more reason to consider defensive stats, than 1-2% generalized reduction.