You might want to consider a few things especially by going hybrid with holy-ret builds always have plates that gives you stats that increase strength, stamina, and agility while not just your mana pool gear that does +heal/damage, critical strike and critical strike with spells is quite effect for damaging opponents.
You have a good build, though most hybrids use only one build really, but this one is only spec'd for Lv. 60 not Lv. 70, since you don't get many players wanting to spec in them anymore.
Hybrid - 35/0/16