Mine aren't 80 yet (79.5), so I don't know how well this will work, but I think putting this into a rotation could help a ton:

One of the most annoying spells against facing a paladin is that both their hammer and repentance are great stuns. Especially the hammer as damage won't break it. So at the start, open with hungering cold, then creating a cc macro for each paladin:

/castsequence reset=40 [target=arena1,exists,nodead] Hammer of Justice, Repentance
/castsequence reset=40 [target=arena2,exists,nodead] Hammer of Justice, Repentance
/castsequence reset=40 [target=arena3,exists,nodead] Hammer of Justice, Repentance
/castsequence reset=40 [target=arena4,exists,nodead] Hammer of Justice, Repentance

So if they trinket out of hungering cold, the hammer should get them with a full duration stun, and once hammer expires, hit them with repentance. If I recall, hammer doesn't required you to be facing the targets, I'm not sure about repentance.

Again, I have no real experience with this, but adding some CC would help a ton. If Repentance does not require you to face the target, then that may be a better opener as that's a 20 yard range vs the hammers 10 yard.