Since Boxers are usually behind their opponent, and melee don't really have the ability to stand up to us anyway, I don't expect to stack any expertise.

As far as mastery is concerned, the proc for ret paladins is amazing, and I use it all the time. It provides twice the holy power per point than does haste. To manage your holy power, use power auras. Set a large translucent graphic to appear on each paladins screen when they have 3 holy power, or hand of light. You could also set a graphic to appear on the main screen for when each paladin has hand of light, but not holy power.

The proc accounts for a lot of the healing that the team has going for it.