Get someone else to shoulder the burden of some of those levels. How? With the Handy-dandy Reinforce Magice spell.
You cast whatever level of Added Effects you can, then for a mere 100 Zeon extra someone else can add another one! BUT WAIT!! THERE'S MORE!! For each Added Effect THEY cast on their Reinforce Magic spell, they can add one Added Effect to the spell the Reinfoce Magic spell is Reinforcing!! By merely Doubling the eon to a trifling 200, they can add 10 Extra Added effects IN ADDITION to the one already Pledged!! Call now Opperators are standing by!!
But seriously you'd hit the other caps LONG before you ran out of juice that way.