Geeeetting back to the original question, my first step would be to fix Parry. I'd make it so Parry scaled like Crit, where points in Parry affect both rate and % (for tanks only), and make it scale better in general (20 points to 1% sounds pretty good). I'd then add a trait where Parry affects Crit at a 2:1 ratio, so 2 parry = 1 Crit, and make it so tank stances negate this effect. And lastly, for Paladins, I'd give a trait where an incoming attack can be both parried and blocked at the same time (or give a trait where, in Shield Oath, their block rate and % are enhanced by Parry).

More to come on the rest.