I'm not sure if paladin tanks are good enough on Potd, I'd stick to fighter.
I'm breeding through Potd with 2 warrior tanks, 2 DPS ranged pallys (Zealous Defense and Zealous Focus with Crit upgrade, Marksman, gunner, 20% lower ranged attack speed, more damage modal), wizard and priest.
*Breezing not breeding lol. Chanters are also great instead of the pallys, I just never remember to cast their abilities after 3 chants.