One, CD should be much MUCH shorter.
Two, tether should be longer in my opinion. The proximity restriction tends to make the move even less useful, especially because, for some bizarre reason, a lot of healers I've covered tend to
run away from me. If you see a tether to the Pld, WHY ARE YOU RUNNING AWAY??
Lastly, I always thought Cover needed a slight adjustment. Like a % of all dmg covered should be converted to Hp, or Tp, or have some sort of AoE effect or... something that has synergy with the other tank... just something. That way, we'd have a reason to use it besides actively looking for someone who is standing in stupid. I mean, as it is, if everyone is actually doing their jobs and not being idiots you would never have to actually use Cover. That's silly. I shouldn't have to go out of my way to make use of a CD. It's use should have a readily available use.