Slotting Jackie
damage
I normally slot with x4 Expedient Reinforcement, then one of each Defense set, take Manuevers, and then Barrier. That brings Jack very close to the soft cap in normal content.
Since you are using Dark Affinity, you could drop Manuevers possibly and still come out close. I'm less sure about dropping Barrier, mainly because the +Resist is still useful.
For the record, Jack's defenses are 25% to all most except Fire/Cold, and 35% to those. So, 25% + 2 Defense IOs = 35%, + Manuevers = ~39.5%, + Barrier T4 (low point) = ~44.5%. You could ignore that and count on debuffs to make up the difference, but for various reasons debuffs aren't 100% reliable.
I have been mulling over how I want to slot Jack Frost in my Ice Control/Darkness Affinity Controller. *Currently I have planned for 4 slots in it. *I have: Expedient Reinforcement: Resist Bonus, Call to Arms: Defense Bonus, Sovereign Right: Resistance Bonus, Edict of the Master: Defense Bonus, available, and was going to just slot all four into it. Though that sounds stupidly like overkill even with Dark Servent, which is going to be 6 slotted with 4 Dark Watcher's Despair, Tough of the Nictus (Proc) and Cloud Senses (Proc).
What would be most appropriate slotting for Jackie, of the Aura bonuses and other IOs and HOs? I don't have a budget.