WHM + AST/Diurnal = good
WHM + AST/Noct = Meh but good
SCH + AST/Diurnal = good
SCH + AST/Noct = BAD. SCH is always going to over write Noct because he has a higher cure potency, even with the 5% boost that Noct gives. Also you don't need to save the SCH mp because they don't have mana issues and AST do.